Rocks & Minerals

Texas Rocks and Minerals

Links With the Past in the Plant World

The Lost Lemuria

Pleistocene Bats from San Josecito Cave, Nuevo Leon, Mexico

The Rise and Progress of Palaeontology

The Ultimate Rockhounding Handbook

Snails

Walks and Talks in the Geological Field

Fragments of Earth Lore: Sketches & Addresses Geological and Geographical

Cave Regions of the Ozarks and Black Hills

Underground Treasures: How and Where to Find Them

The Geology of Groton State Forest

Across Mongolian Plains

A Short History of the Academy of Natural Sciences of Philadelphia

Devils Tower National Monument

The Ornithosauria

Ancient Landscapes of the Grand Canyon Region

The Book of the Pearl

The Geology of Mt. Mansfield State Forest

Texas Gemstones