- Oakes, Edward L.1
- Oldale, Robert N.1
- Ontario. Department of Mines1
- Outerbridge, William F.1
- Pennsylvania. Bureau of Topographic and Geologic Survey1
- Peterson, Warren Lee, 1925-1
- Péwé, Troy Lewis, 1918-19991
- Puffett, Willard P. (Willard Penry), 1922-1
- Rainey, Henry C.1
- Raisz, Erwin, 1893-19681
- Reeves, Robert G. (Robert Grier), 1920-1
- Rhodesia and Nyasaland. Federal Dept. of Trigonometrical and Topographical Surveys1
- Rice, Charles L.1
- Richards, Paul W.1
- Romania. Comitetul Geologic1
- Sable, Edward G. (Edward George), 1924-1
- Schnabel, Robert W.1
- Scott, Glenn Robert, 1918-1
- Seiders, Victor M.1
- Sharps, Joseph A.1
GeoBlacklight version 4.1.0
