http://dewey.info/scheme/a14/ en
620 Engineering and allied operations
620.002 Miscellany
620.0028 Auxiliary techniques and procedures; apparatus, equipment, materials
http://dewey.info/scheme/a14/ vi
620 Kỹ thuật và các hoạt động liên quan
620.002 Tài liệu hỗn hợp
620.0028 Kỹ thuật và quy trình phụ trợ; máy móc, thiết bị, vật liệu
http://dewey.info/scheme/a14/ it
620 Ingegneria e attività affini
620.002 Miscellanea
620.0028 Tecniche e procedure ausiliarie; apparecchi, attrezzature, materiali
http://dewey.info/scheme/edition/e23/ en
620 Engineering and allied operations
620.002 Miscellany
620.0023 Engineering--vocational guidance
Dewey Decimal Classification
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