Beards

Free to read here, from Project Gutenberg.

Beaver: An Alphabet of Typical Specimens

John Kettelwell

The Philosophy of Beards

Thomas S. Gowing

Trichocosmos: Notes historical, æsthetical, ethnological, physiological, anecdotal and tonsorial, on the hair & beard

Anonymous

Pogonologia; Or, A Philosophical and Historical Essay on Beards

J.-A. Dulaure