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Dever Campbell Ashmead
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Anthracite losses and reserves in Pennsylvania
Dever Campbell Ashmead · Dept. of Forests and Waters, Topographic and Geologic Survey
71 sayfa · 1925
Anthracite coal / Coal mines and mining
Anthracite losses and reserves in Pennsylvania, by Dever C. Ashmead.
Ashmead, Dever C. (Dever Campbell), b. 1884. · Pennsylvania Bureau of Topographic and Geologic Survey
78 sayfa · 1926
Coal mines and mining -- Pennsylvania