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Guiding High-school Students of Vocational Agriculture in Developing Farming Programs ... by E.J. Johnson, W.N. Elam

E. J. JohnsonW. N. Elam

出版	U.S. Government Printing Office, 1954
URL	http://books.google.com.hk/books?id=bhuSXwAACAAJ&hl=&source=gbs_api