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  1. 1
    Recovering byproduct heavy minerals from sand and gravel, placer gold, and industrial mineral operations /
    by Gomes, J. M. (John M.)
    Published 1979
    Government Document Book
  2. 2
    Recovery of byproduct heavy minerals from sand and gravel operations in Oregon and Washington /
    by Martinez, G. M. (George M.)
    Published 1981
    Government Document Book
  3. 3
    Recovery of byproduct heavy minerals from sand and gravel operations in central and southern California /
    by Gomes, J. M. (John M.)
    Published 1980
    Government Document Book
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