@book{ Solr-ocm41976200, title = {Quarrying and crushing methods and costs at the Avon Mountain trap rock quarry of the Atlas Sand, Gravel & Stone Co., West Hartford, Conn.}, series = {Information circular / United States Department of the Interior, Bureau of Mines}, series = {Information circular (United States. Bureau of Mines)}, author = {Dunning, J. S.}, editor = {United States. Bureau of Mines}, publisher = {U.S. Dept. of the Interior, Bureau of Mines}, year = {1936}, pages = {7}, }