http://dewey.info/scheme/a14/ en
001.9 Controversial knowledge
001.94 Mysteries
001.942 Unidentified flying objects (UFOs) 001.944 Monsters and related phenomena
http://dewey.info/scheme/a14/ vi
001.9 Tri thức còn tranh luận
001.94 Điều bí ẩn
001.942 Vật thể bay không xác định 001.944 Quái vật và các hiện tượng liên quan
http://dewey.info/scheme/a14/ it
001.9 Conoscenze controverse
001.94 Misteri
001.942 Oggetti volanti non identificati (UFO) 001.944 Mostri e fenomeni connessi
http://dewey.info/scheme/edition/e23/ en
001.9 Controversial knowledge
001.94 Mysteries
001.942 Unidentified flying objects (UFOs) 001.944 Monsters and related phenomena
http://dewey.info/scheme/edition/e22/ de
001.9 Grenzwissen
001.94 Mysterien
001.942 Unbekannte Flugobjekte (UFOs) 001.944 Ungeheuer und verwandte Phänomene
Dewey Decimal Classification
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