http://dewey.info/scheme/edition/e23/ en
338.2728 Petroleum--extractive economics
338.27282 Oil (Petroleum)--extractive economics
http://dewey.info/scheme/edition/e22/ de
338.2728 Erdöl (Naturprodukt)—mineralische Rohstoffwirtschaft, . . .
338.27282 Öl (Erdöl)—mineralische Rohstoffwirtschaft
Dewey Decimal Classification
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