- Hanukkah, by Cathy Goldberg Fishman ; illustrations by Mary O'Keefe Young
- Curious about spring, written by Cynthia Platt ; illustrated in the style of H.A. Rey by Mary O'Keefe Young
- Margret & H.A. Rey's Happy Easter Curious George, written by R.P. Anderson ; illustrated in the style of H.A. Rey by Mary O'Keefe Young
- Curious George. Curious about fall, written by Cynthia Platt ; illustrated in the style of H.A. Rey by Mary O'Keefe Young
- 1000 Books Before Kindergarten, 93
- Margret & H.A. Rey's Merry Christmas, Curious George, written by Cathy Hapka ; illustrated in the style of H.A. Rey by Mary O'Keefe Young
- Biscuit's 100th day of school, story by Alyssa Satin Capucilli ; pictures by Mary O'Keefe Young
- Curious George visits the dentist, written by Monica Perez ; illustrated in the style of H.A. Rey by Mary O'Keefe Young
- Curious George joins the team, Cynthia Platt ; illustrated in the style of H.A. Rey by Mary O'Keefe Young
- Spookley the square pumpkin, a family to be thankful for, written and created by Joe Troiano ; illustrated by Mary O' Keefe Young
- Curious George goes to the zoo, written by Cynthia Platt ; illustrated in the style of H.A. Rey by Mary O'Keefe Young
- Curious George visits the dentist, written by Monica Perez ; illustrated in the style of H.A. Rey by Mary O'Keefe Young
- Hanukkah, by Cathy Goldberg Fishman ; illustrations by Mary O'Keefe Young
- Maria Tallchief, prima ballerina, written by Vee Browne ; illustrated by Mary O'Keefe Young
- Curious George, stories to share, Margret and H.A. Rey
- The snow walker, Margaret K. and Charles M. Wetterer ; illustrations by Mary O'Keefe Young
- Margret & H.A. Rey's Curious George goes swimming, written by Alessandra Preziosi ; illustrated in the style of H.A. Rey by Mary O'Keefe Young
- Writing for freedom, a story about Lydia Maria Child, by Erica Stux ; illustrations by Mary O'Keefe Young
- It's Ramadan, Curious George, written by Hena Khan ; illustrated by Mary O'Keefe Young
- Margret & H.A. Rey's Merry Christmas, Curious George [braille], written by Cathy Hapka ; illustrated in the style of H.A. Rey by Mary O'Keefe Young
- Get well, Curious George, written by Julie M. Fenner, illustrated in the style of H.A. Rey by Mary O'Keefe Young
- Something magic, by Maggie S. Davis ; illustrated by Mary O'Keefe Young
- Curious George goes to a bookstore, written by Julie M. Bartynski ; illustrated in the style of H.A. Rey by Mary O'Keefe Young
- Biscuit's show and share day, by Alyssa Satin Capucilli ; pictures by Mary O'Keefe Young
- Curious George goes swimming, written by Alessandra Preziosi ; illustrated in the style of H.A. Rey by Mary O'Keefe Young
- Happy Hanukkah, Curious George, cover and interior illustrations by Mary O'Keefe Young ; written by Emily Flaschner Meyer
- Happy Hanukkah, Curious George, [written by Emily Flaschner Meyer ; cover and interior illustrations by Mary O'Keefe Young]
- Chicken soup for little souls, the never-forgotten doll, story adapted from "A doll for great-grandmother" by Jacqueline Hickey ; story adaptation by Lisa McCourt ; illustrated by Mary O'Keefe Young
- Margret & H.A. Rey's Curious George and the pizza party, written by Cynthia Platt ; illustrated in the style of H.A. Rey by Mary O'Keefe Young
- Curious George, curious about winter, illustrated in the style of H.A. Rey by Mary O'Keefe Young
- Mery Christmas, Curious George, written by Cathy Hapka ; illustrated in the style of H.A. Rey by Mary O'Keefe Young
- Margret & H.A. Rey's Curious George and the summer games, written by Monica Perez ; illustrated in the style of H.A. Rey by Mary O'Keefe Young
- Feliz Navidad, Jorge el curioso, Merry Christmas, Curious George, escrito por/written by, Cathy Hapka ; illustrado en el estilo de/illustrated in the style of, H.A. Rey ; traducido por/translated by, Carlos E. Calvo ; por/by Mary O'Keefe Young
- Happy birthday, Curious George, cover and interior illustrations by Mary O'Keefe Young ; written by Emily Meyer
- Curious George saves his pennies, written by Monica Perez ; illustrated by Mary O'Keefe Young
- Revolutionary poet, a story about Phillis Wheatley, by Maryann N. Weidt ; illustrations by Mary O'Keefe Young
- The moon is following me, by Philip Heckman ; illustrated by Mary O'Keefe Young
- Happy St. Patrick's Day, Curious George, written by Cynthia Platt ; illustrations by Mary O'Keefe Young ; [created by Margret and H. A. Rey]
- Chicken soup for the little souls, 3 colorful stories to warm the hearts of children, story adaptations by Lisa McCourt ; illustrated by Pat Grant Porter, Bert Dodson, and Mary O'Keefe Young
- Curious George's dictionary, from the editors of the American Heritage Dictionaries ; illustrated in the style of H.A. Rey by Mary O'Keefe Young ; additional illustrations by H.A. Rey and in the style of Mary O'Keefe Young by Anna Grossnickle Hines [and others]
- The daring escape of Ellen Craft, by Cathy Moore ; illustrations by Mary O'Keefe Young
- Biscuit is thankful, by Alyssa Satin Capucilli ; illustrations by Pat Schories ; [watercolors by Mary O'Keefe Young]
- Happy Thanksgiving, Curious George, [written by Cynthia Platt and Julie M. Bartynski ; cover and interior illustrations by Mary O'Keefe Young]
- Fire at the Triangle factory, by Holly Littlefield ; illustrations by Mary O'Keefe Young
- Spookley the square pumpkin, a family to be thankful for, Joe Troiano ; illustrated by Mary O'Keefe Young
- The road to Seneca Falls, a story about Elizabeth Cady Stanton, by Gwenyth Swain ; illustrations by Mary O'Keefe Young
- Say it, sign it, written by Elaine Epstein ; illustrated by Mary O'Keefe Young
- Happy Valentine's Day, Curious George!, written by N. Di Angelo ; illustrated in the style of H. A. Rey by Mary O'Keefe Young
- Curious George and the summer games, written by Monica Perez ; illustrated in the style of H.A. Rey by Mary O'Keefe Young
- Chicken soup for little souls, the new kid and the cookie thief, story adaptation by Lisa McCourt ; illustrated by Mary O'Keefe Young