Paige, Leroy Robert "Satchel"
Painted Lady Butterfly
Pakistan
Pal, Bipin Chandra
Palestine Liberation Organization
--Arafat, Yasser
Palomar Mountain Observatory
Palou, Father Francisco
--Mission San Francisco
Paper
--Manufacturing Process
Papin, Denis
Papua New Guinea
Paracelsus
Parakeet, Carolina
Paré, Ambroise
Parícutin
Parker, Charlie "Bird"
Parks, Gordon
Parsons, (Sir) Charles Algernon
Pasternak, Boris Leonidovich
Pasteur, Louis
Paterson, William
Peale, Charles Willson
Peary, Robert Edwin
Peccary, Collared
Peking Man
--Black, Davidson
The Pentagon
Perkins, Frances Coralie
Perry, Oliver Hazard
Pershing, John Joseph
Peterloo Massacre
Pharos at Alexandria
Phenix City, Alabama
Philadelphia Athletics
--Mack, Connie
Philosophy
Phonograph
--History of
Pickering, Timothy
Pierce, Franklin
Pigeon, Homing
Pike, Zebulon Montgomery
Piltdown Man
Pinckney, Charles Cotesworth
Pintail, Northern
Pioneer 10
Pisa, Leaning Tower of
(Pope) Pius XII
Planetoids
Planned Parenthood Federation of America
--Sanger, Margaret Louise
Plow, One-Way Disc
Plow, Steel
--Deere, John
Pluto
Pogue, William Reid
Polk, James Knox
Ponsonby, Vere Brabazon (Earl of Bessborough)
Pony Express
Popes
Porcupine, North American
Porifera
Port Neches, Texas
Post, Wiley Hardeman
Postcards, Exaggerated
Pound, Ezra Loomis
Powell, Adam Clayton, Jr.
Powell, Colin Luther
Powell, Lewis Franklin, Jr.
Prairie Dog, Utah
Preble, Edward
Price, Sterling
Priestley, Joseph
Pronghorn
Prosthetics
--Paré, Ambroise
Pullman, George Mortimer
Pushmataha
Putnam, Israel
Pyramids at Giza