http://dewey.info/scheme/edition/e23/ en
512 Algebra
512.4 Rings
512.42 Modules and ideals 512.44 Commutative rings 512.46 Associative rings 512.48 Nonassociative rings
http://dewey.info/scheme/edition/e22/ de
512 Algebra
512.4 Ringe
512.42 Moduln und Ideale 512.44 Kommutative Ringe 512.46 Assoziative Ringe 512.48 Nichtassoziative Ringe
Dewey Decimal Classification
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