1950
Bibliografía (45 obras)
Tigres (Zoobooks) (Spanish Edition)
2003
Turtles (Zoobooks)
Owls (Zoobooks)
Polar Bears (Zoobooks Series)
2001
Charlemagne
1997
Life in the North during the Civil War
The crusades
1995
The age of feudalism
1994
Wild dogs
1993
The deer family
1992
City Animals
1991
Spiders
Turtles
Polar Bears
The Civil War
Hummingbirds
1990
Atoms
The Challenger
Owls
1989
Tigers
Pompeii (World Disasters)
Black death
Skunks and their relatives
1988
Natural magic and modern science in the poetic works of Novalis and Shelley
1986
Wild Dogs
Las lechuzas
Aranas
Polar bears
Spiders (Zoo Books (Mankato, Minn.).)
