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  1. 1
    Lineboro quadrangle--hydrogeology /
    by Duigon, Mark T.
    Published 1981
    Map
  2. 2
    Hampstead quadrangle--hydrogeology /
    by Duigon, Mark T.
    Published 1981
    Map
  3. 3
    Hydrogeologic atlas, Ellicott City quadrangle, Baltimore and Howard counties, Maryland /
    by Duigon, Mark T.
    Published 1983
    Map
  4. 4
    Hydrogeologic atlas, Hereford quadrangle, Baltimore County, Maryland /
    by Duigon, Mark T.
    Published 1981
    Map
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