Books similar to the following can be used with the lessons in the fourth grade kit.
Module A
Scholastic Book of World Records
World Almanac for Kids
Popular Science: Almanac for Kids
Cookies by William Jaspersohn
Is a Blue Whale the Biggest Thing There Is? by Robert E. Wells
Module B
Gator Pie by Louise Mathews
The Man Who Counted: A Collection of Mathematical Adventures by Malba Tahan
The Unbreakable Code by Sara Hoagland Hunter
Jingle Dancer by Cynthia Leitich Smith
Pushing the Sky: Seven Native American Plays for Children by Joseph Bruchac