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Kaiser, J.: Systematic indexing (1911)
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Bliss, H.E.: Simplified book notation (1910)
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Bliss, H.E.: ¬A modern classification for libraries, with simple notation, mnemonics, and alternatives (1910)
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Mach, E.: ¬Die Leitgedanken meiner naturwissenschaftlichen Erkenntnislehre und ihre Aufnahme durch die Zeitgenossen (1910)
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