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- Rain forests, a nonfiction companion to Afternoon on the Amazon, by Will Osborne and Mary Pope Osborne ; illustrated by Sal Murdocca
- Dinosaurs before dark, adapted by Jenny Laird ; with art by Kelly and Nichole Matthews
- Dinosaurs, by Will Osborne and Mary Pope Osborne ; illustrated by Sal Murdocca
- Leprechauns and Irish folklore, a nonfiction companion to Leprechaun in late winter, Mary Pope Osborne and Natalie Pope Boyce ; illustrated by Sal Murdocca
- Ancient Rome and Pompeii, a nonfiction companion to Vacation under the volcano, by Mary Pope Osborne and Natalie Pope Boyce ; illustrated by Sal Murdocca
- Titanic, a nonfiction companion to Tonight on the Titanic, by Will Osborne and 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
- Dolphins and sharks, a nonfiction companion to Dolphins at daybreak, by Mary Pope Osborne and Natalie Pope Boyce ; illustrated by Sal Murdocca
- Mummies and pyramids, by Will Osborne and 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
- Rags and riches, kids in the time of Charles Dickens, by Mary Pope Osborne and Natalie Pope Boyce ; illustrated by Sal Murdocca
- Ancient Greece and the Olympics, a nonfiction companion to Hour of the Olympics, y 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
- Titanic, a nonfiction companion to Tonight on the Titanic, by Will Osborne and Mary Pope Osborne ; illustrated by Sal Murdocca
- Pirates, by Will Osborne and Mary Pope Osborne ; illustrated by Sal Murdocca
- Magic tricks from the tree house, a fun companion to Hurry up, Houdini!, by Mary Pope Osborne and Natalie Pope Boyce ; illustrated by Sal Murdocca
- Sabertooths and the Ice Age, a nonfiction companion to Sunset of the sabertooth, by Mary Pope Osborne and Natalie Pope Boyce ; illustrated by Sal Murdocca
- Dogsledding and extreme sports, a nonfiction companion to Magic tree house #54, Balto of the Blue Dawn, by Mary Pope Osborne and Natalie Pope Boyce ; illustrated by Carlo Molinari
- Space, by Will Osborne and Mary Pope Osborne ; illustrated by Sal Murdocca
- Soccer, Mary Pope Osborne and Natalie Pope Boyce ; illustrated by Sal Murdocca
- Pilgrims, a nonfiction companion to Thanksgiving on Thursday, by Mary Pope Osborne and Natalie Pope Boyce ; illustrated by Sal Murdocca
- Vikings, by Mary Pope Osborne and Natalie Pope Boyce ; illustrated by Carlo Molinari
- Twisters and other terrible storms, a nonfiction companion to Twister on Tuesday, by Will Osborne and 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
- Osborne, Mary Pope, Magic tree house series, 29
- Osborne, Mary Pope, Magic tree house, #37
- Lions at lunchtime, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Good morning, gorillas, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Osborne, Mary Pope, Magic tree house series, #38
- A perfect time for pandas, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Osborne, Mary Pope, Virginia's diary, bk. 3
- Dingoes at dinnertime, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Osborne, Mary Pope, Magic tree house, #47
- Osborne, Mary Pope, Magic tree house series, 18
- Mummies in the morning, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Osborne, Mary Pope, Magic tree house series, #12
- Osborne, Mary Pope, Magic tree house, #3
- Afternoon on the Amazon, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Leprechauns and Irish folklore, a nonfiction companion to Leprechaun in late winter, Mary Pope Osborne and Natalie Pope Boyce ; illustrated by Sal Murdocca
- Hurry up, Houdini!, by Mary Pope Osborne ; illustrated by Sal Murdocca
- The rocking horse Christmas, by Mary Pope Osborne ; illustrated by Ned Bittinger
- Dinosaurs before dark, Mary Pope Osborne ; illustrated by Sal Murdocca
- Magic tree house, Mary Pope Osborne, Books 33 - 36
- Osborne, Mary Pope, Magic tree house
- Osborne, Mary Pope, Magic tree house series, #2
- Texas, a nonfiction companion to Magic Tree House #30: Hurricane heroes in Texas, Mary Pope Osborne, Natalie Pope Boyce ; illustrated by Isidre Mones
- Osborne, Mary Pope, Magic tree house, #38
- Sirens and sea monsters, by Mary Pope Osborne ; with artwork by Troy Howell
- Summer of the sea serpent, Mary Pope Osborne ; illustrated by Sal Murdocca
- Osborne, Mary Pope, Magic tree house series, #30
- My secret war, the World War II diary of Madeline Beck, Mary Pope Osborne
- My brother's keeper, Virginia's diary, by Mary Pope Osborne
- Osborne, Mary Pope, Magic tree house series, #51
- Osborne, Mary Pope, Magic tree house series, #8
- Dolphins at daybreak, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Stallion by starlight, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Osborne, Mary Pope, Magic tree house series, 31
- Tigers at twilight, by Mary Pope Osborne ; 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
- High tide in Hawaii, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Ancient Rome and Pompeii, a nonfiction companion to Vacation under the volcano, by Mary Pope Osborne and Natalie Pope Boyce ; illustrated by Sal Murdocca
- Wild West, by Mary Pope Osborne and Natalie Pope Boyce ; illustrated by Isidre Monés
- A ghost tale for Christmas time, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Tigers at twilight, 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
- Earthquake in the early morning, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Osborne, Mary Pope, Magic tree house series, #10
- World War II, by Mary Pope Osborne and Natalie Pope Boyce ; illustrated by Carlo Molinari
- Dolphins and sharks, a nonfiction companion to Dolphins at daybreak, by Mary Pope Osborne and Natalie Pope Boyce ; illustrated by Sal Murdocca
- Osborne, Mary Pope, Magic tree house series, #19
- Civil War on Sunday, [Mary Pope Osborne ; illustrated by Sal Murdocca]
- Osborne, Mary Pope, Magic tree house series, #17
- Magic tree house collection, Mary Pope Osborne
- Good morning, gorillas, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Afternoon on the Amazon, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Dinosaurs before dark, Mary Pope Osborne ; illustrated by Sal Murdocca
- Texas, a nonfiction companion to Magic Tree House #30: Hurricane heroes in Texas, Mary Pope Osborne, Natalie Pope Boyce ; illustrated by Isidre Mones
- Wild West, by Mary Pope Osborne and Natalie Pope Boyce ; illustrated by Isidre Monés
- Earthquake in the early morning, by Mary Pope Osborne ; illustrated by Sal Murdocca
- World War II, by Mary Pope Osborne and Natalie Pope Boyce ; illustrated by Carlo Molinari
- Christmas in Camelot, by Mary Pope Osborne
- Hurricane heroes in Texas, by Mary Pope Osborne ; illustrated by AG Ford
- Midnight on the moon, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Vacation under the volcano, 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
- Christmas in Camelot, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Night of the ninth dragon, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Carnival at candlelight, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Buffalo before breakfast, by Mary Pope Osborne ; illustrated by Sal Murdocca
- Summer of the sea serpent, Mary Pope Osborne
- Sunset of the sabertooth, by Mary Pope Osborne ; illustrated by Sal Murdocca
- The knight at dawn, Mary Pope Osborne
- Titanic, a nonfiction companion to Tonight on the Titanic, by Will Osborne and Mary Pope Osborne ; illustrated by Sal Murdocca
- Magic tricks from the tree house, a fun companion to Hurry up, Houdini!, by Mary Pope Osborne and Natalie Pope Boyce ; illustrated by Sal Murdocca
- Baseball, by Mary Pope Osborne and Natalie Pope Boyce ; illustrated by Carlo Molinari
- High time for heroes, Mary Pope Osborne ; illustrated by Sal Murdocca
- Warriors in winter, by Mary Pope Osborne ; illustrated by AG Ford
- Mummies in the morning, by Mary Pope Osborne
- Balto of the Blue Dawn, by Mary Pope Osborne ; illustrated by Sal Murdocca
- To the future, Ben Franklin!, by Mary Pope Osborne ; illustrated by AG Ford
- Dogsledding and extreme sports, a nonfiction companion to Magic tree house #54, Balto of the Blue Dawn, by Mary Pope Osborne and Natalie Pope Boyce ; illustrated by Carlo Molinari
- Night of the Ninjas, by Mary Pope Osborne
- Pirates past noon, by Mary Pope Osborne
- Thanksgiving on Thursday, by Mary Pope Osborne ; illustrated by Sal Murdocca
- A big day for baseball, by Mary Pope Osborne ; jacket illustration by Sal Murdocca ; interior illustrations by Ag Ford
- Warriors, a nonfiction companion to Magic tree house #31: Warriors in Winter, by Mary Pope Osborne and Natalie Pope Boyce ; illustrated by Isidre Monés