Out Like a Light By: Randall Garrett

Out of This World Convention By: Forrest J. Ackerman

Outline of Science, Vol 4 By: J. Arthur Thomson

Outlines of a Mechanical Theory of Storms Containing the True Law of Lunar Influence By: Thomas Bassnett

Outlines of Dairy Bacteriology, 8th edition A Concise Manual for the Use of Students in Dairying By: H. L. (Harry Luman) Russell

Outlines of Greek and Roman Medicine By: James Elliott

Outlines of Lessons in Botany, Part I; from Seed to Leaf By: Jane H. Newell

Pandemic By: Jesse F. Bone

Papers on Health By: John Kirk

Passages from the Life of a Philosopher By: Charles Babbage

Personal Experience of a Physician By: John Ellis

Personal Recollections, from Early Life to Old Age, of Mary Somerville By: Mary Somerville

Peter Cooper The Riverside Biographical Series, Number 4 By: Rossiter W. (Rossiter Worthington) Raymond

Pharaoh's Broker Being the Very Remarkable Experiences in Another World of Isidor Werner By: Ellsworth Douglass

Philadelphia Negro: A Social Study By: W. E. B. Du Bois

Philosophical Transactions of the Royal Society - Vol 1 - 1666 Giving some Accompt of the present Undertakings, Studies, and Labours of the Ingenious in many considerable parts of the World By: Various

Philosophy of Osteopathy By: A. T. (Andrew Taylor) Still

Physics By: Aristotle

Physics and Politics, or, Thoughts on the application of the principles of "natural selection" and "inheritance" to political society By: Walter Bagehot

Pioneer Surgery in Kentucky A Sketch By: David Wendel Yandell

Pioneer Work in Opening the Medical Profession to Women By: Elizabeth Blackwell

Pipe of Peace By: James McKimmey

Pirates of the Gorm By: Nathan Schachner

Plain Facts for Old and Young By: John Harvey Kellogg

Planet of Dreams By: James McKimmey

Pleasant Journey By: Richard F. Thieme

Pleasures of the telescope An Illustrated Guide for Amateur Astronomers and a Popular Description of the Chief Wonders of the Heavens for General Readers By: Garrett Putman Serviss

Pleistocene Bats from San Josecito Cave, Nuevo Leon, Mexico By: J. Knox Jones

Poisoned Air By: Sterner S. Meek

Police Your Planet By: Lester del Rey

Policing the Plains Being the Real-Life Record of the Famous North-West Mounted Police By: R. G. (Roderick George) MacBeth

Politics: A Treatise on Government By: Unknown