@book{ Solr-ocm41253340, title = {Trego lead-zinc mine, Grant County, Wis.}, series = {Report of investigations / United States Department of the Interior, Bureau of Mines}, series = {Report of investigations (United States. Bureau of Mines)}, author = {Cummings, Alvin M.}, publisher = {U.S. Dept. of the Interior, Bureau of Mines}, year = {1948}, pages = {8}, }