@book{ Solr-4729446, title = {Geology and mineral deposits of the Poncha Springs SE quadrangle, Chaffee County, Colorado,}, series = {Geological Survey professional paper.}, author = {Van Alstine, Ralph Erskine, 1914-}, editor = {Colorado. Mining Industrial Development Board}, address = {Washington}, publisher = {U.S. Govt. Print. Off.}, year = {1974}, pages = {19}, note = {"Work done in cooperation with the Colorado State Mining Industrial Development Board."}, }