Libro 1
Animal Babies
Carl Sommer
Libro 2
Animals of the Arctic
Carl Sommer
Libro 3
Animals of the Desert
Carl Sommer
Libro 4
Animals of the Jungle
Carl Sommer
Libro 6
Camping Adventure
Carl Sommer
Libro 7
Farming: Past and Present
Carl Sommer
Libro 8
Fishing for Fun
Carl Sommer
Libro 9
Growing Food
Carl Sommer
Libro 10
Large Land Animals
Carl Sommer
Libro 11
Large Sea Animals
Carl Sommer