Scats and Tracks of the Rocky Mountains: A Field Guide to the Signs of 70 Wildlife Species

Scats and Tracks of the Northeast

Scats and Tracks of the Midwest: A Field Guide to the Signs of Seventy Wildlife Species

Scats and Tracks of Alaska Including the Yukon and British Columbia

Scats and Tracks of the Southeast

Rocks, Gems, and Minerals of the Rocky Mountains

National Audubon Society Field Guide to the Rocky Mountain States: Idaho, Montana, Wyoming, Colorado

Scats and Tracks of the Mid-Atlantic: A Field Guide to the Signs of Seventy Wildlife Species

Scats and Tracks of Alaska Including the Yukon and British Columbia: A Field Guide to the Signs of Sixty-Nine Wildlife Species

Scats and Tracks of the Midwest: A Field Guide to the Signs of Seventy Wildlife Species