James C. Halfpenny

Scats and tracks of the Rocky Mountains

Scats and tracks of the Pacific Coast

Tracking wolves

Yellowstone Bears in the Wild

Yellowstone Wolves in the Wild

Winter

A field guide to mammal tracking in North America

Polar Bears of Canada

Scats and tracks of North America

Scats and tracks of the Great Plains

Scats and tracks of Alaska, including the Yukon and British Columbia

Scats and tracks of the Midwest

Scats and tracks of the Great Lakes

Scats and Tracks of the Pacific Coast State

Field Guide to Scats and Tracks of the Rocky Mountains

Scats and Tracks of the Desert Southwest