Rocks & Minerals

Texas Rocks and Minerals

Links With the Past in the Plant World

Notes on Collecting and Preserving Natural-History Objects

Snails

The Ornithosauria

A Short History of the Academy of Natural Sciences of Philadelphia

Devils Tower National Monument

The Ultimate Rockhounding Handbook

The Glaciers of the Alps

Biology, The Myth Of Evolution

Walks and Talks in the Geological Field

Texas Gemstones

The Book of the Pearl

The Geology of Mt. Mansfield State Forest

The Geology of Groton State Forest

Beach Rambles in Search of Seaside Pebbles and Crystals

British Museum (Natural History) General Guide

Earth Features and Their Meaning An Introduction to Geology for the Student and the General Reader

The Geology of D.A.R. State Park, Mt. Philo State Forest Park, Sand Bar State Park

Texas Rocks and Minerals: An Amateur's Guide