The Path-Way to Knowledg Containing the First Principles of Geometrie By: Robert Record

The Paths of Inland Commerce; a chronicle of trail, road, and waterway By: Archer Butler Hulbert

The Peacemaker By: Alfred Coppel

The Perfectionists By: Arnold Castle

The Perpetuation of Living Beings; hereditary transmission and variation By: Thomas Henry Huxley

The Philosophy of Evolution Together With a Preliminary Essay on The Metaphysical Basis of Science By: Stephen H. (Stephen Haskins) Carpenter

The Physical Life of Woman: Advice to the Maiden, Wife and Mother By: George H. (George Henry) Napheys

The Pioneer Steamship Savannah: A Study for a Scale Model United States National Museum Bulletin 228, 1961, pages 61-80 By: Howard I. Chapelle

The Pivot of Civilization By: Margaret Sanger

The Plague By: Teddy Keller

The Planet with No Nightmare By: Jim Harmon

The Planetoid of Peril By: Paul Ernst

The Players By: Everett B. Cole

The Point of View By: Stanley Grauman Weinbaum

The Positive School of Criminology Three Lectures Given at the University of Naples, Italy on April 22, 23 and 24, 1901 By: Enrico Ferri

The Postage Stamp in War By: Frederick John Melville

The Power of Movement in Plants By: Francis Darwin

The Practice of Autosuggestion By: C. Harry (Cyrus Harry) Brooks

The Premiere By: Richard Sabia

The Present Condition of Organic Nature By: Thomas Henry Huxley

The Press-Gang Afloat and Ashore By: J. R. (John Robert) Hutchinson

The Prison Chaplaincy, And Its Experiences By: Hosea Quinby

The Production of Vinegar from Honey By: Gerard W. Bancks

The Professional Approach By: Theodore Lockhard Thomas

The Pros and Cons of Vivisection By: Charles Richet

The Prospective Mother By: J. Morris Slemons

The Pygmy Planet By: Jack Williamson

The Quantum Jump By: Robert Wicks

The Quest of the Simple Life By: W. J. (William James) Dawson

The Radiant Shell By: Paul Ernst

The Raid on the Termites By: Paul Ernst

The Railroad Builders; a chronicle of the welding of the states By: John Moody