- Ontario. Department of Mines1
- Ontario. Department of Mines, issuing body1
- Outerbridge, William F.1
- Overstreet, William C. (William Courtney), 1919-1
- Peace, Richard R., Jr., 1924-1
- Pepper, James F.1
- Philippines. Bureau of Coast and Geodetic Survey1
- Pneu Michelin (Firm)1
- Post, Edwin V. (Edwin Van Horn), 1928-1
- Price, L. L., geologist1
- Prichard, George E.1
- Québec (Province). Mines Branch1
- Rainey, Henry C.1
- Raisz, Erwin, 1893-19681
- Rand McNally and Company1
- Ravenstein Verlag1
- Rhodesia and Nyasaland. Federal Dept. of Trigonometrical and Topographical Surveys1
- Rhodesia and Nyasaland. Ministry of Agriculture1
- Rice, Charles L.1
- Rogers, William B.1
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