- Office of the Chief of Engineers U.S.A (Washington) (1)
- Office of the Chief of Engineers U.S.A (Washington?) (2)
- Office of the Chief of Engineers, War Dept (Washington, D.C.?) (2)
- Office of the City Engineer? (Newark, Ohio?) (1)
- Office of the Engineer (Jackson, Mich) (1)
- Office of the Supt. Grand Trunk Road (Allahabad) (2)
- Office of the Supt. Grand Trunk Road; Allahabad (2)
- Officina Petri Schenkii (Amsterdam) (1)
- Officine dell 'Istituto Italiano d 'Arti Grafiche ; Pubblicita d 'Arte Crespi e Cortina (1)
- Offsetdruck Edmund Gaillard (1)
- Offsetdruck Edmund Gaillard G.m.b.H. (2)
- Offsetdruck Langebartels u. Jurgens (1)
- Offsetdruck Langebartels und Jurgens (1)
- Offsettiefdruck J.C. Konig & Ebhardt (1)
- Oficina de Longitudes (Bogotä) (1)
- Oficina nueva de Arazoza y Soler (Havana) (1)
- Ogilvie (Montreal, Canada) (1)
- Ohio State Commissioners of Public Printing (Columbus) (1)
- Okuratnaia karta chasti Kamchatki s polozheniem Okhotskago Berega sovsemi Kurilskimi Ostrovami i chastiiuzh IAponii, takozh sieverozapadnoi Ameriki sovsemi Aleutskimi Ostrovami, ili Sieverym Arkhipelagom protiv prezhnikh opisei : vypravlena v Yrkutskie 17 (1)
- Oldsmobile Division, General Motors Corp. (4)
