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- author's%3a%22Poetzsch%2c E.%22 2
- authors%3a%22Poetzsch%2c E.%22 2
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Harnack, A. von: ¬Die Auskunftserteilung als bibliothekarische Aufgabe (1940)
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- Zentralblatt für Bibliothekswesen. 57(1940), S.16-22
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Hutchins, M.: Introduction to reference work (1944)
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