Geology and ore deposits of the Freeland-Lamartine District, Clear Creek County, Colorado : geology and ore deposits of Clear Creek, Gilpin, and Larimer Counties, Colorado /

Autor Harrison, Jack Edward, 1924-1995, Wells, John David, 1926-2013
Vydáno 1956

Stratigraphy and structure of the House Rock Valley area, Coconino County, Arizona /

Autor Wells, John David, 1926-2013
Vydáno 1960