Ecology

North American Plesiosaurs: Elasmosaurus, Cimoliasaurus, and Polycotylus

North American Plesiosaurs: Elasmosaurus, Cimoliasaurus, and Polycotylus

The Pleistocene of North America and its vertebrated animals

The Descent of Man

Citizen Scientist

The Worst of Times

Nature All Around Us

The Palace and Park

The Climate Change Hoax: The Global Warming Deception

Where Men No More May Reap or Sow

The Ivory King

Australasian Fossils: A Students' Manual of Palaeontology

Pennsylvanian invertebrates of the Mazon Creek Area, Illinois: Eurypterida

Scientific Essays and Lectures

Dinosaurs, with Special Reference to the American Museum Collections

Darwinism stated by Darwin himself

The Conditions of Existence as Affecting the Perpetuation of Living Beings

An Expository Outline of the “Vestiges of the Natural History of Creation”

Outlines of Creation

Speciation in the Brazilian Spiny Rats