http://dewey.info/scheme/edition/e23/ en
372.41 Instructional materials, reading readiness, methods of instruction and study
372.412 Instructional materials
http://dewey.info/scheme/edition/e22/ de
372.41 Unterrichtsmaterialien, Lesebereitschaft, Unterrichts- und Lernmethoden
372.412 Unterrichtsmaterialien
Dewey Decimal Classification
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