Mary Pope Boyce Osborne

Ghosts (Magic Tree House Fact Tracker, #20)

Leonardo Da Vinci (Magic Tree House Fact Tracker, #19)

Penguins and Antarctica (Magic Tree House Fact Tracker, #18)

Magic Tree House Fact Tracker #30

Pilgrims (Magic Tree House Fact Tracker, #13)

Dog Heroes (Magic Tree House Fact Tracker, #24)

Heroes for All Times (Magic Tree House Fact Tracker, #28)

Tsunamis and Other Natural Disasters (Magic Tree House Fact Tracker, #15)

Polar Bears and the Arctic (Magic Tree House Fact Tracker, #16)

Rags and Riches (Magic Tree House Fact Tracker, #22)

Ancient Rome and Pompeii (Magic Tree House Fact Tracker, #14)

Leprechauns and Irish Folklore (Magic Tree House Fact Tracker, #21)

Sea Monsters (Magic Tree House Fact Tracker, #17)

Snakes and Other Reptiles (Magic Tree House Fact Tracker, #23)

Ancient Greece and the Olympics (Magic Tree House Fact Tracker, #10)