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Geology of phospathe deposits of northern peninsular Florida
by Gilbert H. Espenshade and Charles W. S...
Bok Engelsk 1963
Kyanite, sillimanite, and andalusite deposits of the Southeastern States
by Gilbert H. Espenshade and Donald B. Po...
Bok Engelsk 1960
Geology and mineral deposits of the James River-Roanoke River manganese district, Virginia
Espenshade, Gilbert H.
Bok Engelsk 1954