Voyage Inside the Cell
1999
The Unconquered
2017
LeapFrog: Numbers Ahoy
2011
Out of the Frying Pan Into the Firing Line
1942
The Grain That Built a Hemisphere
1943
The New Spirit
1942
7 Wise Dwarfs
1941
Defense Against Invasion
1943
Sniffy Escapes Poisoning
1967
Dinosaurs: Puzzles from the Past
1981
The Social Side of Health
1969
LeapFrog: A Tad of Christmas Cheer
2007
Free to Be… You and Me
1974
LeapFrog: Math Adventure to the Moon
2009
Foods and Fun: A Nutrition Adventure
1980
The Queen of the Waves
1936
Facts and Figures or Whatever Happened to Dick
1970
The Underseas Explorers
—
Powers of Ten
1977
The Story of Menstruation
1946