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theme_ss:"Geschichte der Klassifikationssysteme"
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theme_ss:"International bedeutende Universalklassifikationen"
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year_i:[1970 TO 1980}
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- author's%3a%22Laan%2c H. van der%22 2
- authors%3a%22Laan%2c H. van der%22 2
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Dahlberg, I.: Major developments in classification (1977)
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Friis-Hansen, J.B.: What Dewey knew (1976)
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