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  1. 1
    by Krishna Rao, C.
    Published 1975
    Hyderabad : Andhra Pradesh Akademi of Sciences, [pref. 1975]
    66, 12 p. : map ; 23 cm.
  2. 2
    by Singh, Harbans, 1907-
    Published 1966
    New Delhi : Farm Information Unit, Directorate of Extension, Ministry of Agriculture, 1966, 1973 printing.
    xii, 296 p. ; 25 cm.
  3. 3
    New Delhi, Indian Council of Agricultural Research [c1962]
    xiii, 342 p. illus., maps. 25 cm.

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