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  1. 1
    Hierarchical systems analysis in karst terrains /
    Published 2000
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  2. 2
    Specification aggregate quarry expansion : a case study demonstrating sustainable management of natural aggregate resources /
    by Langer, William H.
    Published 2003
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  3. 3
    Managing and protecting aggregate resources /
    by Langer, William H.
    Published 2002
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  4. 4
    Natural aggregates of the conterminous United States /
    by Langer, William H.
    Published 1988
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  5. 5
    An introduction to using surface geophysics to characterize sand and gravel deposits /
    by Lucius, Jeffrey E.
    Published 2006
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  6. 6
    An introduction to using surface geophysics to characterize sand and gravel deposits /
    by Lucius, Jeffrey E.
    Published 2007
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    Government Document eBook
  7. 7
    Aggregate resource availability in the conterminous United States, including suggestions for addressing shortages, quality, and environmental concerns /
    by Langer, William H.
    Published 2011
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  8. 8
    Natural aggregate : building America's future /
    by Langer, William H., Glanzman, V. M.
    Published 1993
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    Government Document eBook
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