- Parliamentary Recruiting Committee ; Harrow, Mdx. : David Allen & Sons, Ltd. (1)
- Parliamentary Recruiting Committee] (1)
- Parvus, Jo[annes] (variant Petit, Jean) (25)
- Parvus, Joannes (variant Petit, Jean) (18)
- Passenger Dept., Southern Pacific Co (San Francisco, Calif) (1)
- Pastor's Aid Society (St. Peter, Minn.) (1)
- Patterson publishing co. (Chicago), 1921 (1)
- Paul Lubede (1)
- Paul Maerien (1)
- Paul Parey (Berlin) (5)
- Paxton's Magazine of Botany. vol 8. London: W.S. Orr & Co. (London) (1)
- Państwowy Instytut Wydawniczy (Warsaw), 1991 (1)
- Peabody Coal Co (Chicago), 1903 (1)
- Peace News (London), 1966 (1)
- Pennsylvania Chamber of Commerce (Harrisburg), 1925 (1)
- Pennsylvania Geological Survey (Harrisburg?) (1)
- Penumbra Theatre Company (St. Paul) (5)
- Perry Colourprint LTD. (1)
- Perry Nursery Company, (Rochester, New York) (1)
- Perthes (Gotha) (2)
