http://dewey.info/scheme/edition/e23/ en
331.881 Labor unions by industry and occupation
331.8811 Labor unions in industries and occupations other than extractive, manufacturing, construction
http://dewey.info/scheme/edition/e22/ de
331.881 Gewerkschaften nach Industrie und Beruf
331.8811 Gewerkschaften in anderen Industrien als den, anderen Berufen als in den Grundstoffindustrien, dem verarbeitenden Gewerbe, der Bauwirtschaft
Dewey Decimal Classification
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