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Google圖書搜尋
Directory of the Extension Service
出版
C. L. Mast
, 1979
URL
http://books.google.com.hk/books?id=-BTaAAAAIAAJ&hl=&source=gbs_api
註釋
Editions prior to 1940 consist of lists of agricultural extension workers also included in Directory of agricultural and home economics leaders and its supplements.