Magic Treehouse7,9,17,23 & Dinosaur Field Guide 1,by Mary Pope Osborne, PB B32

Magic Treehouse #s: 7 Sunset of the Sabertooth, 9 Dolphins at Daybreak, 17 Tonight on the Titanic, 23 Twister on  Tuesday, and "Dinosaur Field Guide 1" by Mary Pope Osborne are children's books published by Random House Children's Books in 1996. These books  are written in English and feature illustrations. They're part of a series of books that follows the adventures of a siblings who travel through time using a magical treehouse. The book series combines educational elements with a fun and engaging story, making it a popular choice for young readers.