A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Observationes Astronomicae in Specula Regia Monachiensi Institutae atque Regio jussu Publicis impensis Editae
Observations Made During The Year At The United States Naval Observatory
Observatory, The: A Review of Astronomy
Occasional Paper / International Union of Forest Research Organizations
Oceanologia
Oceanus
Odessa Astronomical Publications / Odesskij Gosudarstvennvij Universitet Im. I. I. Meunikova (1995)Oil Crops Outlook (OCS)
Operational Plan / World Fish Center
Optical Review (1994-1998)
Optics Express
Opto & Laser Europe (OLE)
Österreichische Forst- und Jagdzeitung (formerly: Österreichische Forstzeitung )
Outlook for U.S. Agricultural Trade (AES-BB)
OYO BUTURI