http://dewey.info/scheme/a14/ en
021 Relationships of libraries, archives, information centers
021.7 Promotion of libraries, archives, information centers
http://dewey.info/scheme/a14/ vi
021 Quan hệ của các thư viện, cơ quan lưu trữ, trung tâm thông tin
021.7 Thúc đẩy thư viện, cơ quan lưu trữ, trung tâm thông tin
http://dewey.info/scheme/a14/ it
021 Relazioni delle biblioteche, degli archivi, dei centri d'informazione
021.7 Promozione delle biblioteche, degli archivi, dei centri d'informazione
http://dewey.info/scheme/edition/e23/ en
021 Relationships of libraries, archives, information centers
021.7 Promotion of libraries, archives, information centers
Dewey Decimal Classification
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