Animals

Bee-Keeping

Birds and their nests

The Migration of North American Birds

The Lone Swallows

Krag and Johnny Bear

Field, Forest and Farm

The prey of the strongest

The Book of the Ocean

Fifty Years a Hunter and Trapper

Wild Life in Southern Seas

Life Among the Butterflies

Friends and Foes in the Australian Bush

The Ornithosauria

Natural History of the Ground Squirrels of California

Natural History: Fishes

A Short History of the Academy of Natural Sciences of Philadelphia

Natural History: Mollusca

From North Pole to Equator: Studies of Wild Life and Scenes in Many Lands

Birds of Song and Story

Two Ways of Becoming a Hunter