- Pipiringos, G. N. (George Nicholas), 1918-1
- Pneu Michelin (Firm)1
- Pomeroy, John S., 1929-1
- Portugal. Direcção Geral de Minas e Serviços Geológicos1
- Potter, R. R.1
- Prest, Victor Kent1
- Prostka, Harold J.1
- Pye, E. G.1
- Randall, Allan D., 1932-1
- Reed, Philip C.1
- Ritzma, Howard R., cartographer1
- Roen, John B.1
- Rohrer, Willis L.1
- Ruppel, Edward Thompson, 1925-1
- Saxton, Christopher, 1542?- cartographer1
- Schafer, John P. (John Phillip), 1922-1
- Schmidt, Robert George1
- Servicio Geológico de Bolivia, cartographer1
- Shamburger, Victor M.1
- Sharpe, John I., 1934-1
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