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

The Peacemaker By: Alfred Coppel

The Penal Cluster By: Randall Garrett

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

The Railroad Question A historical and practical treatise on railroads, and remedies for their abuses By: William Larrabee

The Rain Cloud or, An Account of the Nature, Properties, Dangers and Uses of Rain in Various Parts of the World By: Charles Tomlinson

The Red Record Tabulated Statistics and Alleged Causes of Lynching in the United States By: Ida B. Wells-Barnett

The Reminiscences of an Astronomer By: Simon Newcomb

The Renewal of Life; How and When to Tell the Story to the Young By: Margaret Warner Morley

The Repairman By: Harry Harrison

The Revolt on Venus By: Carey Rockwell

The Right Time By: John Berryman

The Rise and Progress of Palaeontology By: Thomas Henry Huxley

The Risk Profession By: Donald E. Westlake

The Romance of Mathematics Being the Original Researches of a Lady Professor of GirthamCollege in Polemical Science By: P. Hampson

The Romance of Modern Chemistry By: James C. Philip

The Romance of Names By: Ernest Weekley

The Royal Road to Health By: Charles Alfred Tyrrell

The Rural Life Problem of the United States Notes of an Irish Observer By: Horace Curzon Plunkett

The Rural Motor Express To Conserve Foodstuffs and Labor and to Supply Rural Transportation. By: United States. Council of National Defense. Highways Transport Committee

The Sailor's Word-Book An Alphabetical Digest of Nautical Terms, including Some More Especially Military and Scientific, but Useful to Seamen; as well as Archaisms of Early Voyagers, etc. By: W. H. (William Henry) Smyth

The Sargasso of Space By: Edmond Hamilton

The Sceptical Chymistor Chymico-Physical Doubts By: Robert Boyle

The School and the World By: Victor Gollancz

The Science of Fingerprints Classification and Uses By: United States. Federal Bureau of Investigation

The Scientific Evidences of Organic Evolution By: George John Romanes

The Second Voice By: Mann Rubin

The Secret of a Happy Home (1896) By: Marion Harland

The Secret of the Island By: Jules Verne

The Seed of the Toc-Toc Birds By: George Henry Weiss

The Sensitive Man By: Poul William Anderson

The Servant Problem By: Robert F. Young