http://dewey.info/scheme/edition/e23/ en
891.66 Welsh (Cymric) literature
891.661 Welsh poetry
891.661009 Welsh poetry--history and criticism 891.6611 Welsh poetry--early period to 1599 891.6612 Welsh poetry--1600-1999 891.6613 Welsh poetry--2000-
http://dewey.info/scheme/edition/e22/ de
891.66 Walisische (Kymrische) Literatur
891.661 Walisische Versdichtung
891.661009 Walisische Versdichtung--Geschichte und Literaturwissenschaft 891.6611 Walisische Versdichtung--Frühzeit bis 1599 891.6612 Walisische Versdichtung--1600–1999 891.6613 Walisische Versdichtung--2000–
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