http://dewey.info/scheme/edition/e23/ en
154.6 Sleep phenomena
154.63 Dreams
154.630835 Dreams--psychology--adolescents 154.632 Nightmares
http://dewey.info/scheme/edition/e22/ de
154.6 Schlafphänomene
154.63 Träume
154.630835 Träume—Psychologie—Jugendliche 154.632 Albträume
Dewey Decimal Classification
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