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Vorstius, J.: Zur Theorie der primären Nationalbibliographie (1930)
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- Zentralblatt für Bibliothekswesen. 47(1930), S.323-343
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Vorstius, J.: Kritische Gedanken über den neuesten Beitrag zur Kataloggeschichte und Kataloglehre (1934)
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- Zentralblatt für Bibliothekswesen. 51(1934), S.567-578