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  1. 1
    Published 1996
    New Delhi : Produced by Society for Participatory Research in Asia, in collaboration with Envirotech Instruments Pvt. Ltd., 1996.
    v, 130 p. ; 24 cm.
  2. 2
    by Ramachandra Rao, H. P.
    Published 1990
    Bangalore : Karnataka State Council for Science and Technology, 1990.
    viii, 146 p. : ill. ; 28 cm.

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