http://dewey.info/scheme/edition/e23/ en
622.34 Metals
622.342 Precious metals
622.3422 Gold 622.3423 Silver 622.3424 Platinum
http://dewey.info/scheme/edition/e22/ de
622.34 Metalle
622.342 Edelmetalle
622.3422 Gold 622.3423 Silber 622.3424 Platin
Dewey Decimal Classification
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