Showing 1 - 3 results of 3 for search '"Pittsburgh"', query time: 0.15s Refine Results
  1. 1
    Geologic conditions affecting coal mine ground control in the western United States /
    by Sames, Gary P.
    Published 1988
    Government Document Book
  2. 2
    Application of carbonate-silica flotation techniques to western phosphate materials /
    by Rule, A. R. (Albert R.)
    Published 1982
    Government Document Book
  3. 3
    Potential for recovery of rutile and other byproducts from western copper tailings /
    Government Document Book
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