- Nemitz, M.2
- New York (State). State Engineer and Surveyor2
- Nichols, J. A.2
- Nicollet, J. N. (Joseph Nicolas), 1786-18432
- North-Western Provinces (India). Superintendent, Grand Trunk Road2
- North-Western Provinces (India). Superintendent, Grand Trunk Road.2
- Olmsted, Frederick Law, 1822-19032
- Ontario. Department of Crown Lands2
- Oregon State Highway Commission2
- Ottens, R. (Reinier), 1698-17502
- Paine, Paul M2
- Pennsylvania State Chamber of Commerce. State Publicity Bureau2
- Phippen, S.J.2
- Portillo, Pedro2
- Québec (Province). Département des terres de la couronne2
- R.W. Johnson & Son (Firm : Saint Paul, Minn.)2
- Railroad Commission of Washington2
- Rand Avery Supply Co2
- Real Estate Title and Trust Co. (Portland, Or.)2
- Reuben H. Donnelley Corporation2