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1Published 1966Madras : Government of Madras, 1966.vi, 346 p. : ill. ; 24 cm.Subjects: “...Agricultural productivity India Tamil Nadu....”
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2by Singh, D. V., 1949-
Published 1989Shimla, India : Agro-Economic Research Centre, Himachal Pradesh University, 1989.74 p. ; 29 cm.Subjects: “...Agricultural productivity India Himachal Pradesh....”