Popular Lectures on Scientific Subjects By: Hermann von Helmholtz

Popular Lectures on Zoonomia Or The Laws of Animal Life, in Health and Disease By: Thomas Garnett

Popular Science Monthly Oct, Nov, Dec, 1915 — Volume 86 By: Anonymous

Popular Superstitions, and the Truths Contained Therein By: Herbert Mayo

Porto Rico: The Land of the Rich Port By: Joseph B. Seabury

Possessed By: Cleveland Moffett

Postmark Ganymede By: Robert Silverberg

Power Through Repose By: Annie Payson Call

Practical Talks by an Astronomer By: Harold Jacoby

Practical Taxidermy A manual of instruction By: Montagu Browne

Prehistoric Men By: Robert J. Braidwood

Prejudices, First Series By: H. L. Mencken

Preliminary Report on Neo-Fascist and Hate Groups By: House Un-American Activities Committee

Prelude to Space By: Robert W. Haseltine

Prevalence of Imprisonment in the U.S. Population, 1974-2001 By: Thomas P. Bonczar

Preventable Diseases By: Woods Hutchinson

Priestess of the Flame By: Sewell Peaslee Wright

Priestley in America 1794-1804 By: Edgar Fahs Smith

Primitive Love and Love-Stories By: Henry Theophilus Finck

Primitive Psycho-Therapy and Quackery By: Robert Means Lawrence

Princes and Poisoners: Studies of the Court of Louis XIV By: Frantz Funck-Brentano

Prisoners of Poverty Abroad By: Helen Campbell

Prisoners Their Own Warders A Record of the Convict Prison at Singapore in the Straits Settlements Established 1825 By: W. D. Bayliss

PRoblem By: Alan Edward Nourse

Problems of Poverty By: John A. Hobson

Prof. Koch's Method to Cure Tuberculosis Popularly Treated By: Max Birnbaum

Project Trinity 1945-1946 By: Steve Rohrer

Prologue to an Analogue By: Leigh Richmond

Proserpina, Volume 1 Studies of Wayside Flowers, While the Air was Yet Pure Among the Alps and in the Scotland and England Which My Father Knew By: John Ruskin

Proserpina, Volume 2 Studies of Wayside Flowers, While the Air was Yet Pure Among the Alps and in the Scotland and England Which My Father Knew By: John Ruskin

Psichopath By: Randall Garrett

Psychology of Peoples: Its Influence on Their Evolution By: Gustave Le Bon