The exchange of bibliographic data and the MARC format. Proceedings of the International Seminar on the Marc Format and the Exchange of bibliographic Data in Machine Readable Form. Sponsored by the Volkswagen Foundation, Berlin, June 14th-16th 1971 - International Seminar on the MARC Format and the Exchange of bibliographic Data in Machine ReadaSe Form <1971, Berlin, West> (Bibliotheks- und Informationspraxis, 1973)