Evolution

The Earliest Europeans

The Intelligent Creation of Life

Hung Like An Argentine Duck: A Journey Back In Time To The Origins Of Sexual Intimacy

On the Origin of Species By Means of Natural Selection

Curvology

New Perspectives on Horned Dinosaurs

Schenk's Theory: The Determination of Sex

Pioneers of Evolution from Thales to Huxley

The Last Link: Our Present Knowledge of the Descent of Man

The genetic and the operative evidence relating to secondary sexual characters

The Effect of External Influences upon Development

A New Human

Illogical Geology, the Weakest Point in the Evolution Theory

The Butterfly Hunter

Humanology

The Evolution Controversy in America

Darwinism and Race Progress

The Theories of Darwin and Their Relation to Philosophy, Religion, and Morality

Science & Cosmic Messengers

The Conditions of Existence as Affecting the Perpetuation of Living Beings