Ecology

The Geography of New Jersey

The Treasure of the Humble

The Land of Enchantment: From Pike's Peak to the Pacific

Shaggycoat

The Underworld of Oregon Caves National Monument

Island Trail at Walnut Canyon. Walnut Canyon National Monument

Carlsbad Caverns National Park, New Mexico

The Climate Change Hoax: The Global Warming Deception

The South Country

The Manatitlans or, A record of recent scientific explorations in the Andean La Plata, S. A

Fresh Fields

Narrative of a Journey to the Summit of Mont Blanc

Some Common Birds in Their Relation to Agriculture

Burton Island State Park: Guide to the Interpretive Nature Trail and Hiking Trail

The honey bee: a manual of instruction in apiculture

The Hunting Wasps

Wild Earth

The book of earth

The Lone Swallows

The Strangest Things in the World: A Book About Extraordinary Manifestations of Nature