scholarly article by Lloyd William Stephenson & Chase Palmer published 1915 in Geological Survey Professional Paper
article
scientific article published in 1955
scientific article published in 1914
Washington, Govt. print. off., 1914.
scientific article published in 1952
scientific article published in 1953
scientific article published in 1936
scientific article published in 1947
scientific article published in 1917
article published in 1955
scientific article published in 1953
scientific article published in 1937
scientific article published in 1931
scientific article published in 1915
scientific article published in 1933
volume 6 (in two parts) of the book series Maryland geological survey
article by C.S. Ross et al published 1929 in Geological Survey Professional Paper
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