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- Nepal. Nāpīvibhāga1
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- Oficional Nacional de Hidrografia y Geodesia (ONHG)1
- Owen, W. F. W., 1774-18571
- Papua New Guinea. National Mapping Bureau1
- Pepper, W., active 18581
- Pisani, Almorò Alvise, 1754-18081
- Portugal. Direcção Geral de Ordenamento do Território1
- Radefeld, Carl Christian Franz, 1788-18741
- Rapkin, J.1
- Republic Geodetic Authority (Serbia)1
- Riverside County (Calif.). Geographic Information Services1
- Rouet, Paul1
- Russell, John, fl. 1733-17951
- Sacramento County GIS1
- San Joaquin County (Calif.).Community Development Department1
- Santa Clara Valley Water District (Calif.)1
- Saudi Arabia. General Commission for Survey1
