OCLC Online Computer Library Center
Office de la langue française (OLF)
OLF (Office de la langue française)
OMPI (Organisation mondiale de la propriété intellectuelle)
ONE (OPAC Network in Europe)
Online Book Initiative (The) (OBI)
On-Line Books Page (The)
Online Computer Library Center (OCLC)
Online Institute for Cyberspace Law and Policy (The) / University of California
OPAC 97 (catalogue de la British Library)