O
| 17233 EN | Ocean (Eyewitness) | MacQuitty, Miranda | 7.7 | 1 |
| 12289 EN | Ocean Life | Horton, Casey | 5.5 | 0.5 |
| 20605 EN | Ocean Mammals (A True Book) | Landau, Elaine | 5.2 | 0.5 |
| 2809 EN | Ocean, The | Baker, Alan | 2.6 | 0.5 |
| 15984 EN | Oceans | Morris, Neil | 5.6 | 0.5 |
| 66374 EN | October | Brode, Robyn | 2.3 | 0.5 |
| 89766 EN | Octopus | Stone, Lynn M. | 4.2 | 0.5 |
| 11778 EN | Octopus Is Amazing, An | Lauber, Patricia | 3.9 | 0.5 |
| 102782 EN | Octopuses and Other Animals with Amazing Senses | Labella, Susan | 2.3 | 0.5 |
| 102907 EN | Octopuses and Squid | Legg, Gerald | 4.9 | 0.5 |
| 61924 EN | Octopuses (Welcome to the World of Animals) | Swanson, Diane | 5.5 | 0.5 |
| 29966 EN | Odd Velvet | Whitcomb, Mary E. | 4.1 | 0.5 |
| 18737 EN | Off and Running | Soto, Gary | 4.4 | 3 |
| 25215 EN | Off the Rim | Bowen, Fred | 4.2 | 2 |
| 14100 EN | Officer Buckle and Gloria | Rathmann, Peggy | 3.4 | 0.5 |
| 120217 EN | Oggie Cooder | Weeks, Sarah | 5.1 | 3 |
| 74428 EN | Oh, Baby! | Krulik, Nancy | 3 | 1 |
| 77848 EN | Oh, Look! | Polacco, Patricia | 2.1 | 0.5 |
| 9038 EN | Oh Say Can You Say? | Seuss, Dr. | 4 | 0.5 |
| 9039 EN | Oh, the Places You'll Go! | Seuss, Dr. | 3.3 | 0.5 |
| 9040 EN | Oh, the Thinks You Can Think! | Seuss, Dr. | 1.8 | 0.5 |
| 21407 EN | Oh, Tucker! | Kroll, Steven | 1.2 | 0.5 |
| 7835 EN | Ohio (America the Beautiful) | Kent, Deborah | 8.5 | 3 |
| 12435 EN | Ohio (From Sea to Shining Sea) | Fradin, Dennis B. | 4.4 | 1 |
| 20185 EN | Ohio (United States) | Joseph, Paul | 4.9 | 0.5 |
| 13217 EN | Oil, Coal and Gas (From This Earth) | Russell, William | 5 | 0.5 |
| 906042 EN | Ojibwe Legends (M-MH Edition) | Hirano, Yoko Mia | 3.5 | 0.5 |
| 7836 EN | Oklahoma (America the Beautiful) | Heinrichs, Ann | 8.2 | 3 |
| 12436 EN | Oklahoma (From Sea to Shining Sea) | Fradin, Dennis/Judith | 4.3 | 1 |
| 20186 EN | Oklahoma (United States) | Joseph, Paul | 4.7 | 0.5 |
| 22949 EN | Old Bear | Hissey, Jane | 3.9 | 0.5 |
| 6080 EN | Old Black Fly | Aylesworth, Jim | 1.4 | 0.5 |
| 101238 EN | Old Country, The | Gerstein, Mordicai | 4.4 | 4 |
| 10681 EN | Old Man and the Bear, The | Hanel, Wolfram | 4 | 0.5 |
| 105711 EN | Old Mo | Hsu, Stacey W. | 0.5 | 0.5 |
| 5323 EN | Old Motel Mystery, The | Warner, Gertrude Chandler | 4 | 2 |
| 65 EN | Old Mother West Wind | Burgess, Thornton | 5.2 | 3 |
| 906007 EN | Old Stormalong: An American Legend (M-MH Edition) | West, Liz | 5 | 0.5 |
| 9644 EN | Old Turtle | Wood, Douglas | 3.8 | 0.5 |
| 73394 EN | Old Turtle and the Broken Truth | Wood, Douglas | 4.5 | 0.5 |
| 82156 EN | Old Willis Place: A Ghost Story, The | Hahn, Mary Downing | 4.2 | 7 |
| 6081 EN | Old Woman and Her Pig, The | Kimmel, Eric A. | 2.4 | 0.5 |
| 25270 EN | Old Woman Who Loved to Read, The | Winch, John | 3.1 | 0.5 |
| 6581 EN | Old World Monkeys (Creative Ed.) | Elwood, Ann | 5.4 | 0.5 |
| 66 EN | Old Yeller | Gipson, Fred | 5 | 5 |
| 78755 EN | Olive, My Love | Walsh, Vivian | 2.7 | 0.5 |
| 71432 EN | Olive's Ocean | Henkes, Kevin | 4.7 | 4 |
| 79197 EN | Olive, the Other Reindeer | Walsh, Vivian | 3.4 | 0.5 |
| 7336 EN | Oliver | Hoff, Syd | 2.1 | 0.5 |
| 18640 EN | Oliver & Amanda and the Big Snow | Leeuwen, Jean Van | 2.2 | 0.5 |
| 51673 EN | Oliver Button Is a Sissy | De Paola, Tomie | 2.9 | 0.5 |
| 284 EN | Oliver Dibbs to the Rescue! | Steiner, Barbara | 4 | 4 |
| 9289 EN | Oliver Pig at School | Leeuwen, Jean Van | 2.5 | 0.5 |
| 30547 EN | Oliver Twist (Great Illustrated Classics) | Dickens/Leighton | 4.6 | 2 |
| 44266 EN | Olivia | Falconer, Ian | 2 | 0.5 |
| 113690 EN | Olivia Kidney and the Secret Beneath the City | Potter, Ellen | 5.3 | 12 |
| 11559 EN | Olympic Dream | Christopher, Matt | 4.9 | 5 |
| 9041 EN | On Beyond Zebra | Seuss, Dr. | 4.2 | 0.5 |
| 18887 EN | On Bicycles (Safety) | Carter, Kyle | 3.8 | 0.5 |
| 25561 EN | On Board the Titanic: What It Was Like When the Great Liner Sank | Tanaka, Shelley | 4.4 | 1 |
| 107341 EN | On Call Back Mountain | Bunting, Eve | 2.8 | 0.5 |
| 109979 EN | On Christmas Eve | Martin, Ann | 4.7 | 3 |
| 6082 EN | On Mother's Lap | Scott, Ann | 2 | 0.5 |
| 128 EN | On My Honor | Bauer, Marion Dane | 4.7 | 2 |
| 900439 EN | On the Ball (MH Edition) | Burgan, Michael | 4.5 | 0.5 |
| 67 EN | On the Banks of Plum Creek | Wilder, Laura Ingalls | 4.6 | 8 |
| 100093 EN | On the Bike with...Lance Armstrong | Stout, Glenn | 6.9 | 4 |
| 900400 EN | On the Bus with Joanna Cole (MH) | Cole, Joanna | 5.1 | 0.5 |
| 35570 EN | On the Course with...Tiger Woods | Christopher, Matt | 7.1 | 4 |
| 35568 EN | On the Court with...Grant Hill | Christopher, Matt | 7.7 | 3 |
| 77877 EN | On the Court with...Jennifer Capriati | Christopher, Matt | 6.8 | 3 |
| 67170 EN | On the Court with...Kobe Bryant | Stout, Glenn | 7.1 | 3 |
| 35575 EN | On the Court with...Michael Jordan | Christopher, Matt | 6.6 | 4 |
| 73838 EN | On the Court with...Shaquille O'Neal | Stout, Glenn | 6.6 | 3 |
| 67171 EN | On the Court with...Venus and Serena Williams | Stout, Glenn | 6.8 | 3 |
| 83055 EN | On the Court with...Yao Ming | Stout, Glenn | 7.1 | 3 |
| 630 EN | On the Far Side of the Mountain | George, Jean Craighead | 4.5 | 6 |
| 67172 EN | On the Field with...Alex Rodriguez | Stout, Glen | 6.3 | 3 |
| 45691 EN | On the Field with...Derek Jeter | Stout, Glen | 6.8 | 4 |
| 35573 EN | On the Field with...Emmitt Smith | Christopher, Matt | 6.3 | 3 |
| 35576 EN | On the Field with...Mia Hamm | Christopher, Matt | 7 | 4 |
| 67173 EN | On the Halfpipe with...Tony Hawk | Stout, Glenn | 7.9 | 3 |
| 905955 EN | On the Moon (M-MH Edition) | Wortman-Wunder, Emily | 5.6 | 0.5 |
| 77520 EN | On the Mound with...Curt Schilling | Christopher, Matt | 6.6 | 3 |
| 35569 EN | On the Mound with...Greg Maddux | Christopher, Matt | 6.2 | 4 |
| 48335 EN | On the Track with...Jeff Gordon | Stout, Glenn | 7 | 3 |
| 118645 EN | On Thin Ice | Krulik, Nancy | 3.5 | 2 |
| 11184 EN | On Top of Spaghetti | Glazer, Tom | 2.1 | 0.5 |
| 106394 EN | On Top of Spaghetti | Johnson, Paul Brett | 3.3 | 0.5 |
| 900435 EN | On Track (MH Edition) | Rowland, Della | 4.6 | 0.5 |
| 82527 EN | On Your Mark, Get Set, Laugh! | Krulik, Nancy | 3.2 | 1 |
| 85752 EN | Once Upon a Curse | Baker, E.D. | 5.6 | 9 |
| 62564 EN | Once Upon a Marigold | Ferris, Jean | 5.7 | 8 |
| 27519 EN | Once When I Was Scared | Pittman, Helena Clare | 3.5 | 0.5 |
| 59437 EN | One Afternoon | Heo, Yumi | 2.4 | 0.5 |
| 906314 EN | One Big Baby (M-MH Edition) | Onish, Liane B. | 2 | 0.5 |
| 41434 EN | One Dark and Scary Night | Cosby, Bill | 3 | 0.5 |
| 9619 EN | One Day at HorrorLand | Stine, R.L. | 3.4 | 3 |
| 11432 EN | One Day in the Alpine Tundra | George, Jean Craighead | 5.5 | 1 |
| 14688 EN | One Day in the Desert | George, Jean Craighead | 5.5 | 1 |
| 14689 EN | One Day in the Prairie | George, Jean Craighead | 5 | 1 |
| 10899 EN | One Day in the Tropical Rain Forest | George, Jean Craighead | 5.2 | 1 |
| 53789 EN | One Day You'll Know | Brooke, Lauren | 4.5 | 6 |
| 44824 EN | One Eye Laughing, the Other Weeping: The Diary of Julie Weiss | Denenberg, Barry | 5.6 | 6 |
| 241 EN | One-Eyed Cat | Fox, Paula | 5.4 | 7 |
| 5488 EN | One Fine Day | Hogrogian, Nonny | 3.5 | 0.5 |
| 9042 EN | One Fish, Two Fish, Red Fish, Blue Fish | Seuss, Dr. | 1.7 | 0.5 |
| 20689 EN | One Giant Leap: The Story of Neil Armstrong | Brown, Don | 4.6 | 0.5 |
| 43458 EN | One Gorilla | Morozumi, Atsuko | 1.7 | 0.5 |
| 19476 EN | One Hundred Hungry Ants | Pinczes, Elinor J. | 2.6 | 0.5 |
| 58859 EN | One Hungry Cat | Rocklin, Joanne | 2.2 | 0.5 |
| 679 EN | One in the Middle Is the Green Kangaroo, The | Blume, Judy | 2.5 | 0.5 |
| 49756 EN | One Lonely Sea Horse | Freymann, Saxton | 1.8 | 0.5 |
| 58521 EN | One Lucky Summer | Kvasnosky, Laura McGee | 3.9 | 3 |
| 29937 EN | One Monkey Too Many | Koller, Jackie French | 2.7 | 0.5 |
| 24964 EN | One More River | Banks, Lynne Reid | 5 | 9 |
| 7585 EN | One Morning in Maine | McCloskey, Robert | 4.4 | 0.5 |
| 85424 EN | One Night in Doom House | Stine, R.L. | 3.3 | 3 |
| 5239 EN | One of the Third Grade Thonkers | Naylor, Phyllis Reynolds | 5.1 | 4 |
| 6083 EN | One of Three | Johnson, Angela | 2.4 | 0.5 |
| 113956 EN | One Saturday Evening | Baker, Barbara | 2.1 | 0.5 |
| 40707 EN | One Saturday Morning | Baker, Barbara | 2.2 | 0.5 |
| 105712 EN | One Smart Fish | Manivong, Laura | 0.9 | 0.5 |
| 24920 EN | One Summer Day | Lewis, Kim | 2 | 0.5 |
| 112405 EN | One Well: The Story of Water on Earth | Strauss, Rochelle | 6 | 1 |
| 900592 EN | One Year in the West (MH Edition) | Smith, Geof | 5.9 | 0.5 |
| 68 EN | Onion John | Krumgold, Joseph | 4.5 | 8 |
| 14690 EN | Onion Sundaes | Adler, David A. | 3.3 | 1 |
| 86073 EN | Only Emma | Warner, Sally | 3.9 | 2 |
| 2883 EN | Only Some Big Cats Can Roar | Llewellyn, Claire | 3.8 | 0.5 |
| 78736 EN | Only Tadpoles Have Tails | Clarke, Jane | 2 | 0.5 |
| 18641 EN | Oops! | McNaughton, Colin | 2.7 | 0.5 |
| 42161 EN | Oops, Clifford! | Bridwell, Norman | 1.9 | 0.5 |
| 906167 EN | Oops! Food Surprises (M-MH Edition) | Licameli, Doris | 3.9 | 0.5 |
| 83071 EN | Ooze, The | Stine, R.L. | 3.1 | 2 |
| 112703 EN | Open Wide | Krulik, Nancy | 3.5 | 1 |
| 900393 EN | Open Wide, Don't Bite! (MH) | Time-for-Kids-Editors | 3.1 | 0.5 |
| 900569 EN | Opera, Karate, and Bandits (MH) | Nhuong, Huynh Quang | 5.5 | 0.5 |
| 65442 EN | Opossums (What's Awake?) | Whitehouse, Patricia | 1.6 | 0.5 |
| 6582 EN | Orangutans (Creative Ed.) | Wexo, John Bonnett | 5.8 | 0.5 |
| 13033 EN | Orangutans (Monkey Discovery) | Stone, Lynn M. | 3.7 | 0.5 |
| 83610 EN | Orchard of the Crescent Moon/Emlyn's Moon | Nimmo, Jenny | 4.7 | 5 |
| 380 EN | Ordinary Jack | Cresswell, Helen | 5.6 | 8 |
| 7837 EN | Oregon (America the Beautiful) | Stein, R. Conrad | 8.2 | 3 |
| 12437 EN | Oregon (From Sea to Shining Sea) | Fradin, Dennis/Judith | 4.4 | 1 |
| 905964 EN | Oregon Trail: Westward Ho! (M-MH Edition), The | Orlando, Louise | 4.3 | 0.5 |
| 20187 EN | Oregon (United States) | Joseph, Paul | 4.8 | 0.5 |
| 24672 EN | Oriental Shorthair Cats | Kallen, Stuart A. | 4.3 | 0.5 |
| 5222 EN | Original Adventures of Hank the Cowdog, The | Erickson, John R. | 4.5 | 3 |
| 24984 EN | Orphan of Ellis Island, The | Woodruff, Elvira | 4.9 | 5 |
| 105886 EN | Orphan Puppy | Dale, Jenny | 4.3 | 3 |
| 7337 EN | Oscar Otter | Benchley, Nathaniel | 2.6 | 0.5 |
| 65460 EN | Ostrich (Zoo Animals) | Whitehouse, Patricia | 2 | 0.5 |
| 6583 EN | Ostriches, Emus, Rheas, Kiwis & Cassowaries (Creative Ed.) | Elwood, Ann | 4.9 | 0.5 |
| 59317 EN | Ostriches & Other Ratites (Wildlife Ed.) | Elwood, Ann | 5.6 | 0.5 |
| 28543 EN | Other Shepards, The | Griffin, Adele | 5 | 6 |
| 14640 EN | Other Side of the Bridge, The | Hanel, Wolfram | 2.9 | 0.5 |
| 488 EN | Otherwise Known as Sheila the Great | Blume, Judy | 3.5 | 4 |
| 6482 EN | Otis Spofford | Cleary, Beverly | 4.6 | 4 |
| 906193 EN | Our City Gardens (M-MH Edition) | Williams, Gail | 3.2 | 0.5 |
| 56700 EN | Our Gracie Aunt | Woodson, Jacqueline | 2.6 | 0.5 |
| 29294 EN | Our Old House | Vizurraga, Susan | 3.9 | 0.5 |
| 35294 EN | Our Only May Amelia | Holm, Jennifer L. | 4.8 | 7 |
| 80678 EN | Our Silly Garden | Nagel, Karen Berman | 1.9 | 0.5 |
| 6007 EN | Our Sixth-Grade Sugar Babies | Bunting, Eve | 3.9 | 4 |
| 44826 EN | Our Strange New Land: Elizabeth's Diary...Virginia,1609 | Hermes, Patricia | 3.2 | 2 |
| 19540 EN | Out of Darkness: The Story of Louis Braille | Freedman, Russell | 6.7 | 2 |
| 11728 EN | Out of Nowhere | Sebestyen, Ouida | 4.5 | 6 |
| 84731 EN | Out of the Dark | Komorn, Julie | 5.1 | 3 |
| 62757 EN | Out of the Deep | Skurzynski/Ferguson | 5.1 | 5 |
| 18783 EN | Out of the Dust | Hesse, Karen | 5.3 | 3 |
| 59793 EN | Out to Lunch | Krulik, Nancy | 3.6 | 1 |
| 15097 EN | Outcast of Redwall | Jacques, Brian | 6.3 | 15 |
| 100602 EN | Outcast, The | Lasky, Kathryn | 5.1 | 6 |
| 76086 EN | Outcasts of 19 Schuyler Place, The | Konigsburg, E.L. | 5.5 | 9 |
| 17585 EN | Outer Space Mystery, The | Warner, Gertrude Chandler | 3.7 | 2 |
| 28230 EN | Outside and Inside Bats | Markle, Sandra | 5.6 | 1 |
| 28233 EN | Outside and Inside Snakes | Markle, Sandra | 5.1 | 0.5 |
| 9079 EN | Outside Dog, The | Pomerantz, Charlotte | 2.5 | 0.5 |
| 381 EN | Outsiders, The | Hinton, S.E. | 4.7 | 7 |
| 11185 EN | Over and Over | Zolotow, Charlotte | 3.9 | 0.5 |
| 129 EN | Over Sea, Under Stone | Cooper, Susan | 5.4 | 12 |
| 60715 EN | Over the Edge | Skurzynski/Ferguson | 5 | 5 |
| 906221 EN | Over the Fence (M-MH Edition) | Murphy, Sally | 2.8 | 0.5 |
| 900576 EN | Over the Top of the World (MH) | Steger/Bowermaster | 5.5 | 0.5 |
| 66872 EN | Overboard | Fama, Elizabeth | 5.1 | 6 |
| 7789 EN | Overland Escape, The | Roddy, Lee | 4.8 | 7 |
| 113372 EN | Owen & Mzee: The Language of Friendship | Hatkoff, Isabella | 6 | 1 |
| 5531 EN | Owl and the Pussycat, The | Lear, Edward | 2.5 | 0.5 |
| 7387 EN | Owl at Home | Lobel, Arnold | 2.7 | 0.5 |
| 23502 EN | Owl Babies | Waddell, Martin | 2.4 | 0.5 |
| 35292 EN | Owl in the Office | Baglio, Ben M. | 4 | 5 |
| 5532 EN | Owl Moon | Yolen, Jane | 3.2 | 0.5 |
| 12091 EN | Owlbert | Harris, Nicholas | 2.9 | 0.5 |
| 102783 EN | Owls and Other Animals with Amazing Eyes | Labella, Susan | 1.8 | 0.5 |
| 6584 EN | Owls (Creative Ed.) | Biel, Timothy Levi | 4.9 | 0.5 |
| 44375 EN | Owly | Thaler, Mike | 2.1 | 0.5 |
| 6084 EN | Ox-Cart Man | Hall, Donald | 4.5 | 0.5 |
| 114835 EN | Ox, House, Stick: The History of Our Alphabet | Robb, Don | 6.2 | 1 |