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  1. 1

    The District of Columbia, its rocks and their geologic history by Carr, Martha S.

    Published: U.S. G.P.O., 1950
    Description: v, 59 pages : illustrations, maps ; 24 cm.
    Book
  2. 2

    The District of Columbia, its rocks and their geologic history : with notes on the geography, early history and stone used in buildings and monuments by Carr, Martha S.

    Published: United States Department of the Interior, Geological Survey, 1950
    Description: 1 online resource (v, 59 pages, 4 pages of plates) : illustrations, maps (some color).
    Government Document eBook