Fossils

Links With the Past in the Plant World

Pleistocene Bats from San Josecito Cave, Nuevo Leon, Mexico

The Ancestry of Modern Amphibia: A Review of the Evidence

The Frozen North

The Coal Measures Amphibia of North America

Cave Hunting

The Rise and Progress of Palaeontology

Voyager 1 Encounters Saturn

The Lost Lemuria

Pleistocene Bats from San Josecito Cave, Nuevo Leon, Mexico

Snails

Australasian Fossils: A Students' Manual of Palaeontology

Life's Dawn on Earth

Fossils: A Story of the Rocks and Their Record of Prehistoric Life Denver Museum of Natural History, Popular Series No. 3

Field Book of Common Rocks and Minerals For identifying the Rocks and Minerals of the United States and interpreting their Origins and Meanings

Animals of the Past

The Glaciers of the Alps

The Coal Measures Amphibia of North America

Evolution

The Radio Boys with the Forest Rangers; Or, The great fire on Spruce Mountain