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Vol. 1 seines Handbuches als erstes Buch zur chemischen Literatur und zur Informationswissenschaft (1919)Zwei Zitate:
"... it is becoming more and more difficult to obtain a complete survey ... of the current scientific production of the day."
(1913)"It is not enough to found libraries. It is necessary ... to instruct those eager for knowledge in the best methods of utilizing their treasures."
(1911)
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Hapke