On Piety By: Jean Guibert

On Secret Service By: William Nelson Taft

On the Babylonian Captivity of the Church By: Martin Luther

On the Exercises of Piety By: Jean Guibert

On the Preparations of the Indian Hemp By: William Brooke O'Shaughnessy

On the Ruin of Britain By: Gildas

On The Trail: An Outdoor Book for Girls By: Adelia B. Beard

On War By: Carl von Clausewitz

Oracles of Nostradamus By: Charles A. Ward

Ordeal of Mark Twain By: Van Wyck Brooks

Origin and Development of Psychoanalysis By: Sigmund Freud

Original Stories from Real Life By: Mary Wollstonecraft

Other People's Lives By: Rosa Nouchette Carey

Our Knowledge Box By: George Blackie

Our Old Home By: Nathaniel Hawthorne

Out of Mulberry Street By: Jacob A. Riis

Out of the Shadow By: Rose Gollup Cohen

Oxford Book of American Essays By: Various

Palmetto Leaves By: Harriet Beecher Stowe

Paradise Regain'd (version 2) By: John Milton

Passages from the Life of a Philosopher By: Charles Babbage

Pearl of Great Price By: Joseph Smith, Jr.

Peeps at People - Being Certain Papers from the Writings of Anne Warrington Witherup By: John Kendrick Bangs

Pep: Poise, Efficiency, Peace By: William C. Hunter

Perfumes and their Preparation By: George William Askinson

Phillips Brooks By: Mark Antony De Wolfe Howe

Physics By: Aristotle

Pictures from Italy By: Charles Dickens

Pierrot, Dog Of Belgium By: Walter Alden Dyer

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

Plain Living By: Rolf Boldrewood

Poison Romance And Poison Mysteries By: Charles John Samuel Thompson

Policy and Passion By: Rosa Campbell Praed

Pollyanna of the Orange Blossoms By: Harriet Lummis Smith

Pollyanna's Jewels By: Harriet Lummis Smith

Post Mortem: Essays, Historical And Medical By: Charles MacLaurin

Pragmatism By: William James

Prairie Traveler By: Randolph B. Marcy

Prayer: Its Necessity, Its Power, Its Conditions By: Ferreol Girardey

Prehistoric Men By: Robert J. Braidwood

Principia Ethica By: George Edward Moore

Prophet By: Kahlil Gibran

Proposed Roads to Freedom By: Bertrand Russell

Protagoras By: Plato (Πλάτων)

Psychotherapy By: Hugo Münsterberg

Public Opinion By: Walter Lippmann

Pussycat Princess By: Edward Anthony

Quatrains of Omar Khayyam of Nishapur By: Omar Khayyám

Queen By: Ottilie Wildermuth

Quiet Talks about Jesus By: Samuel D. Gordon

Quiet Talks on Prayer By: Samuel D. Gordon

Radioisotopes in Medicine By: Earl W. Phelan

Random Reminiscences of Men and Events By: John D. Rockefeller

Rational Theology and Christian Philosophy volume 1 By: John Tulloch

Reason Why By: Robert Kemp Philp

Recollections of Napoleon at St. Helena By: Elizabeth Balcombe Abell

Regulations for the order and discipline of the troops of the United States : part I By: Friedrich Wilhelm Ludolf Gerhard Augustin, Baron von Steuben

Reminiscences of a Southern Hospital, by Its Matron By: Phoebe Yates Pember

Reminiscences Of A Workhouse Medical Officer By: Joseph Rogers

Report of the Airship ''Hindenburg'' Accident Investigation By: United States Department of Commerce