http://dewey.info/scheme/edition/e23/ en
634.975 Gymnosperms
634.9752 Spruces
634.9752678 Spruce budworm--forest pest
http://dewey.info/scheme/edition/e22/ de
634.975 Nacktsamer
634.9752 Fichten
634.9752678 Fichtentriebwickler—Forstschädling
Dewey Decimal Classification
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