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Suthirak Gajharn. (2002) The development of rock salt production by solar equipment . Mahidol University/Bangkok.
Suthirak Gajharn. The development of rock salt production by solar equipment. . Bangkok:Mahidol University, 2002.
Suthirak Gajharn. (2002) The development of rock salt production by solar equipment . Mahidol University/Bangkok.