Anthracite losses and reserves in Pennsylvania, by Dever C. Ashmead.Ashmead, Dever C. (Dever Campbell), b. 1884. · First published 1926Open the Tome
Employment and related statistics of mines and quarries, 1935F. G. Tryon, William Harvey Young, Malcolm Earl Wilson, F. E. Berquist, Maxine M. Otero, Dever C. Ashmead, National Research Project on Reemployment Opportunities and Recent Changes in Industrial Techniques (U.S.), United States. Bureau of Mines, United States. Bureau of the Census · First published 1937Open the Tome
