http://library.bids.org.bd/cgi-bin/koha/opac-search.pl?q=ccl=Provider%3AU.%20S.%20Department%20of%20Agriculture%20%2C&format=rss2 2 0 500 ISBN http://library.bids.org.bd/cgi-bin/koha/opac-detail.pl?biblionumber=32142 By Nelson, Paul Edwin. Washington, D. C. : U. S. Department of Agriculture , 1976 . ii, 21 p. : 28 cm. .

]]> http://library.bids.org.bd/cgi-bin/koha/opac-detail.pl?biblionumber=32142 ISBN http://library.bids.org.bd/cgi-bin/koha/opac-detail.pl?biblionumber=50675 By Trotter, W. K. . Washington : U. S. Department of Agriculture. Economics, Statistics and Cooperatives Service , 1979 . iii, 26p. : 26 cm..

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