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- Season of the sandstorms, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Buffalo before breakfast, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Dinosaurs, by Will Osborne and Mary Pope Osborne ; illustrated by Sal Murdocca
- Shadow of the shark, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Earthquake in the early morning, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Hurry up, Houdini!, by Mary Pope Osborne ; illustrated by Sal Murdocca
- A ghost tale for Christmas time, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Good morning, gorillas, by Mary Pope Osborne ; illustrated by Sal Murdocca
- A good night for ghosts, Mary Pope Osborne ; illustrated by Sal Murdocca
- Day of the Dragon King, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Dingoes at dinnertime, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Danger in the darkest hour, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Pirates past noon, by Mary Pope Osborne ; illustrated by Sal Murdocca
- High tide in Hawaii, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Magic tricks from the tree house, a fun companion to Magic Tree House #50 : hurry up, Houdini!, by Mary Pope Osborne and Natalie Pope Boyce ; illustrated by Sal Murdocca
- Dog heroes, a nonfiction companion to Magic tree house #46: Dogs in the dead of night, by Mary Pope Osborne and Natalie Pope Boyce ; illustrated by Sal Murdocca
- Civil War on Sunday, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Summer of the sea serpent, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Christmas in Camelot, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Polar bears and the Arctic, a nonfiction companion to polar bears past bedtime, by Mary Pope Osborne and Natalie Pope Boyce ; illustrated by Sal Murdocca
- A big day for baseball, by Mary Pope Osborne ; cover illustration by Sal Murdocca ; interior illustrations by Ag Ford
- Ancient Rome and Pompeii, a nonfiction companion to Vacation under the volcano, by Mary Pope Osborne and Natalie Pope Boyce ; illustrated by Sal Murdocca
- Ghosts, a nonfiction companion to a good night for ghosts, by Mary Pope Osborne and Natalie Pope Boyce ; illustrated by Sal Murdocca
- Hour of the Olympics, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Dark day in the deep sea, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Dogs in the dead of night, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Winter of the ice wizard, by Mary Pope Osborne ; illustrated by Sal Murdocca
- A perfect time for pandas, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Haunted castle on Hallows Eve, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Night of the Ninjas, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Ninjas and samurai, a nonfiction companion to Magic tree house #5 : Night of the ninjas, by Mary Pope Osborne and Natalie Pope Boyce ; illustrated by Sal Murdocca
- Magic tree house survival guide, Mary Pope Osborne and Natalie Pope Boyce ; illustrated by Sal Murdocca
- Sea monsters, by Mary Pope Osborne and Natalie Pope Boyce ; illustrated by Sal Murdocca
- Dinosaurs before dark, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Rain forests, a nonfiction companion to Afternoon on the Amazon, by Will Osborne and Mary Pope Osborne ; illustrated by Sal Murdocca
- Stallion by starlight, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Blizzard of the blue moon, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Tsunamis and other natural disasters, a nonfiction companion to High tide in Hawaii, by Mary Pope Osborne and Natalie Pope Boyce ; illustrated by Sal Murdocca
- Carnival at candlelight, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Mummies in the morning, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Knights and castles, by Will Osborne and Mary Pope Osborne ; illustrated by Sal Murdocca
- Night of the ninth dragon, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Vacation under the volcano, by Mary Pope Osborne ; illustrated by Sal Murdocca
- High time for heroes, Mary Pope Osborne ; illustrated by Sal Murdocca
- Ancient Greece and the Olympics, a nonfiction companion to Hour of the Olympics, by Mary Pope Osborne and Natalie Pope Boyce ; illustrated by Sal Murdocca
- American revolution, a nonfiction companion to Revolutionary War on Wednesday, by Mary Pope Osborne and Natalie Pope Boyce ; illustrated by Sal Murdocca
- Pandas and other endangered species, by Mary Pope Osborne and Natalie Pope Boyce ; illustrated by Sal Murdocca
- Moonlight on the magic flute, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Ghost town at sundown, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Leonardo da Vinci, a nonfiction companion to Monday with a mad genius, by Mary Pope Osborne and Natalie Pope Boyce ; illustrated by Sal Murdocca
- Season of the sandstorms, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Buffalo before breakfast, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Dinosaurs, by Will Osborne and Mary Pope Osborne ; illustrated by Sal Murdocca
- Shadow of the shark, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Earthquake in the early morning, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Hurry up, Houdini!, by Mary Pope Osborne ; illustrated by Sal Murdocca
- A ghost tale for Christmas time, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Good morning, gorillas, by Mary Pope Osborne ; illustrated by Sal Murdocca
- A good night for ghosts, Mary Pope Osborne ; illustrated by Sal Murdocca
- Day of the Dragon King, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Dingoes at dinnertime, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Danger in the darkest hour, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Pirates past noon, by Mary Pope Osborne ; illustrated by Sal Murdocca
- High tide in Hawaii, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Magic tricks from the tree house, a fun companion to Magic Tree House #50 : hurry up, Houdini!, by Mary Pope Osborne and Natalie Pope Boyce ; illustrated by Sal Murdocca
- Dog heroes, a nonfiction companion to Magic tree house #46: Dogs in the dead of night, by Mary Pope Osborne and Natalie Pope Boyce ; illustrated by Sal Murdocca
- Civil War on Sunday, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Summer of the sea serpent, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Christmas in Camelot, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Polar bears and the Arctic, a nonfiction companion to polar bears past bedtime, by Mary Pope Osborne and Natalie Pope Boyce ; illustrated by Sal Murdocca
- A big day for baseball, by Mary Pope Osborne ; cover illustration by Sal Murdocca ; interior illustrations by Ag Ford
- Ghosts, a nonfiction companion to a good night for ghosts, by Mary Pope Osborne and Natalie Pope Boyce ; illustrated by Sal Murdocca
- Hour of the Olympics, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Dark day in the deep sea, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Dogs in the dead of night, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Winter of the ice wizard, by Mary Pope Osborne ; illustrated by Sal Murdocca
- A perfect time for pandas, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Haunted castle on Hallows Eve, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Night of the Ninjas, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Ninjas and samurai, a nonfiction companion to Magic tree house #5 : Night of the ninjas, by Mary Pope Osborne and Natalie Pope Boyce ; illustrated by Sal Murdocca
- Magic tree house survival guide, Mary Pope Osborne and Natalie Pope Boyce ; illustrated by Sal Murdocca
- Sea monsters, by Mary Pope Osborne and Natalie Pope Boyce ; illustrated by Sal Murdocca
- Dinosaurs before dark, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Rain forests, a nonfiction companion to Afternoon on the Amazon, by Will Osborne and Mary Pope Osborne ; illustrated by Sal Murdocca
- Stallion by starlight, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Blizzard of the blue moon, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Tsunamis and other natural disasters, a nonfiction companion to High tide in Hawaii, by Mary Pope Osborne and Natalie Pope Boyce ; illustrated by Sal Murdocca
- Carnival at candlelight, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Mummies in the morning, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Night of the ninth dragon, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Vacation under the volcano, by Mary Pope Osborne ; illustrated by Sal Murdocca
- High time for heroes, Mary Pope Osborne ; illustrated by Sal Murdocca
- Ancient Greece and the Olympics, a nonfiction companion to Hour of the Olympics, by Mary Pope Osborne and Natalie Pope Boyce ; illustrated by Sal Murdocca
- American revolution, a nonfiction companion to Revolutionary War on Wednesday, by Mary Pope Osborne and Natalie Pope Boyce ; illustrated by Sal Murdocca
- Pandas and other endangered species, by Mary Pope Osborne and Natalie Pope Boyce ; illustrated by Sal Murdocca
- Moonlight on the magic flute, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Ghost town at sundown, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Viking ships at sunrise, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Night of the new magicians, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Twister on Tuesday, by Mary Pope Osborne ; illustrated by Sal Murdocca