Rocks & Minerals

Texas Rocks and Minerals

Links With the Past in the Plant World

The Coal Measures Amphibia of North America

The Rise and Progress of Palaeontology

The Lost Lemuria

Pleistocene Bats from San Josecito Cave, Nuevo Leon, Mexico

Snails

The Ultimate Rockhounding Handbook

Cave Regions of the Ozarks and Black Hills

Across Mongolian Plains

Underground Treasures: How and Where to Find Them

The Ornithosauria

A Short History of the Academy of Natural Sciences of Philadelphia

Devils Tower National Monument

Fragments of Earth Lore: Sketches & Addresses Geological and Geographical

Walks and Talks in the Geological Field

Notes on Collecting and Preserving Natural-History Objects

The Geology of Groton State Forest

Beach Rambles in Search of Seaside Pebbles and Crystals

The Geologic Story of Glacier National Park