http://dewey.info/scheme/edition/e23/ en
511 General principles of mathematics
511.5 Graph theory
511.52 Trees 511.54 Directed graphs (Digraphs) 511.56 Coloring of graphs
http://dewey.info/scheme/edition/e22/ de
511 Allgemeine mathematische Prinzipien
511.5 Graphentheorie
511.52 Bäume 511.54 Gerichtete Graphen (Digraphen) 511.56 Färbung von Graphen
Dewey Decimal Classification
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