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  1. Upper Cretaceous / Maryland Geological Survey.
    By: Maryland Geological Survey. - Bassler, Ray S. - Berry, Edward Wilber, - Clark, William Bullock, - Gardner, Julia Anna, - Goldman, Marcus I. - Pilsbry, Henry Augustus, - Stephenson, Lloyd William,
    Publication info: Baltimore,The Johns Hopkins press,1916.
    Contributed by: University of California Libraries (archive.org)
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