found: Work cat.: Ascent of Coropuna, 1912:t.p. (Coropuna)
found: GEOnet web site, July 6, 2007(Coropuna, Nevado; mountain; variants: Coropuna, Nudo de; Coropuna; 15⁰31ʹ13ʺS 072⁰39ʹ26ʺW)
found: Wikipedia, July 6, 2007(Nevado Coropuna is the largest and highest volcano in Peru)
found: Nat. Geog. atlas, 1990(Coropuna, Nevado)
found: Google search, Sept. 27, 2007(Google keyword search results for Nevado Coropuna totaled 663 entries; keyword search results for Mount Coropuna totaled 97 entries)
found: Columbia gaz.(Coropuna, Nudo; in the Cordillera Occidental)