http://dewey.info/scheme/edition/e23/ en
551.7 Historical geology
551.79 Quaternary period
551.792 Pleistocene epoch (Ice age) 551.793 Holocene epoch
http://dewey.info/scheme/edition/e22/ de
551.7 Historische Geologie
551.79 Quartär
551.792 Pleistozän (Eiszeit) 551.793 Holozän
Dewey Decimal Classification
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