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  1. 1
    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
  2. 2
    Heavy-mineral data from samples collected in Willapa Bay and vicinity, Washington /
    by Luepke, Gretchen
    Published 1982
    Government Document Book
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