- 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
- Rinker, Andrew2
- Roeser, C. (Charles)2
- Roeser, Charles2
- Rogers, F. Kimball2
- Runkel, A.C2
- S. Lewis and Co. (London, England)2
- Sardeson, Frederik W.2
- Schmahl, Julius A. (Julius August), 1867-19552