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First 40 books of the Magic Tree House series in order

D. B. Chamberlain
The list author says: "There are also "Research Guide" books for several of the books which go into more detail about the book's theme. Amazon limits amount of books you can add to a listmania list, so these are only the first forty. All of her books are listed out at http://www.randomhouse.com/kids/magictreehouse/books.html."
Dinosaurs Before Dark (Magic Tree House, No. 1)
Dinosaurs Before Dark (Magic Tree House, No. 1)
The Knight at Dawn (Magic Tree House, No. 2)
The Knight at Dawn (Magic Tree House, No. 2)
Mummies in the Morning (Magic Tree House, No. 3)
Mummies in the Morning (Magic Tree House, No. 3)
Pirates Past Noon (Magic Tree House, No. 4)
Pirates Past Noon (Magic Tree House, No. 4)
Night of the Ninjas (Magic Tree House, No. 5)
Night of the Ninjas (Magic Tree House, No. 5)
Afternoon on the Amazon (Magic Tree House, No. 6)
Afternoon on the Amazon (Magic Tree House, No. 6)
Sunset of the Sabertooth (Magic Tree House, No. 7)
Sunset of the Sabertooth (Magic Tree House, No. 7)
Midnight on the Moon (Magic Tree House, No. 8)
Midnight on the Moon (Magic Tree House, No. 8)
Dolphins at Daybreak (Magic Tree House, No. 9)
Dolphins at Daybreak (Magic Tree House, No. 9)
Ghost Town at Sundown (Magic Tree House)
Ghost Town at Sundown (Magic Tree House)
Lions at Lunchtime (Magic Tree House, No. 11)
Lions at Lunchtime (Magic Tree House, No. 11)
Polar Bears Past Bedtime (Magic Tree House, No. 12)
Polar Bears Past Bedtime (Magic Tree House, No. 12)
Vacation Under the Volcano (Magic Tree House, No. 13)
Vacation Under the Volcano (Magic Tree House, No. 13)
Day Of The Dragon-King (Magic Tree House 14, paper)
Day Of The Dragon-King (Magic Tree House 14, paper)
Viking Ships At Sunrise (Magic Tree House, No. 15)
Viking Ships At Sunrise (Magic Tree House, No. 15)
Hour of the Olympics (Magic Tree House #16) (A Stepping Stone Book(TM))
Hour of the Olympics (Magic Tree House #16) (A Stepping Stone Book(TM))
Tonight on the Titanic (Magic Tree House, No. 17)
Tonight on the Titanic (Magic Tree House, No. 17)
Buffalo Before Breakfast (Magic Tree House #18)
Buffalo Before Breakfast (Magic Tree House #18)
Tigers at Twilight (Magic Tree House, No. 19)
Tigers at Twilight (Magic Tree House, No. 19)
Dingoes at Dinnertime (Magic Tree House, No. 20)
Dingoes at Dinnertime (Magic Tree House, No. 20)
Civil War On Sunday (Magic Tree House #21)
Civil War On Sunday (Magic Tree House #21)
Magic Tree House #22: Revolutionary War on Wednesday (A Stepping Stone Book(TM))
Magic Tree House #22: Revolutionary War on Wednesday (A Stepping Stone Book(TM))
Twister on Tuesday (Magic Tree House, No. 23)
Twister on Tuesday (Magic Tree House, No. 23)
Earthquake in the Early Morning (Magic Tree House #24) (A Stepping Stone Book(TM))
Earthquake in the Early Morning (Magic Tree House #24) (A Stepping Stone Book(TM))
Stage Fright on a Summer Night (Magic Tree House #25)
Stage Fright on a Summer Night (Magic Tree House #25)
Good Morning, Gorillas (Magic Tree House #26)
Good Morning, Gorillas (Magic Tree House #26)
Thanksgiving on Thursday (Magic Tree House #27)
Thanksgiving on Thursday (Magic Tree House #27)
High Tide in Hawaii (Magic Tree House 28)
High Tide in Hawaii (Magic Tree House 28)
Christmas in Camelot (Magic Tree House, No. 29)
Christmas in Camelot (Magic Tree House, No. 29)
Haunted Castle on Hallow's Eve (Magic Tree House, 30)
Haunted Castle on Hallow's Eve (Magic Tree House, 30)
Summer of the Sea Serpent (Magic Tree House, No. 31)
Summer of the Sea Serpent (Magic Tree House, No. 31)
Winter of the Ice Wizard (Magic Tree House 32)
Winter of the Ice Wizard (Magic Tree House 32)
Carnival at Candlelight (Magic Tree House #33)
Carnival at Candlelight (Magic Tree House #33)
Season of the Sandstorms (Magic Tree House #34)
Season of the Sandstorms (Magic Tree House #34)
Night of the New Magicians (Magic Tree House #35)
Night of the New Magicians (Magic Tree House #35)
Blizzard of the Blue Moon (Magic Tree House)
Blizzard of the Blue Moon (Magic Tree House)
Dragon of the Red Dawn (Magic Tree House # 37, A Merlin Mission)
Dragon of the Red Dawn (Magic Tree House # 37, A Merlin Mission)
Monday with a Mad Genius (Magic Tree House, No. 38)
Monday with a Mad Genius (Magic Tree House, No. 38)
Dark Day in the Deep Sea (Magic Tree House, No. 39)
Dark Day in the Deep Sea (Magic Tree House, No. 39)
Eve of the Emperor Penguin (Magic Tree House, No. 40)
Eve of the Emperor Penguin (Magic Tree House, No. 40)