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其他書名
(past and Present)
出版National Technical Information Service, 1975
URLhttp://books.google.com.hk/books?id=fCkZDqnANBIC&hl=&source=gbs_api
註釋Report presenting the subject classification scheme used by the USA national level technical information service (ntis) to classify and index documents in the fields of industry, technology and sociology.