International encyclopedia of abbreviations and acronyms of organizations = Internationale Enzyklopädie der Abkürzungen und Akronyme von Organisationen /
Wennrich, Peter.
Spillner, Paul.
Spillner, Paul.World guide to abbreviations.
München ; New York : K.G. Saur,
1990-1994.
English and German.
Rev. ed. of: World guide to abbreviations / Paul Spillner. 2nd ed. 1970-1972.
v. 9. Instr-O.
Associations, institutions, etc.
Associations, institutions, etc.