A systematic study of the Cooper ornithological club; a sketch of evolutionary development with illustrations and descriptions of type specimens ...

"Published at the fourth annual meeting of the Cooper ornithological club."

Evolutionary socialism: a criticism and affirmation. (Die voraussetzungen des sozialismus und die aufgaben der sozialdemokratie.)

Mode of access: Internet.

The science and origin of life; a handbook of human science, setting forth in clear English the natural laws of generation and hybridization, in refutation of evolutionary theories.

Mode of access: Internet.

Societal evolution; a study of the evolutionary basis of the science of society,

Mode of access: Internet.