@inbook {, title = {The Geomorphology of the Colca River Canyon}, booktitle = {Descubriendo el Valle del Colca - Discovering the Colca Valley}, year = {1987}, note = {Mauricio de Roma{\~n}a, Jaume Blassi, Jordi Blassi ; pr{\'o}logo de Mario Vargas Llosa.ill. (chiefly col.) ; 30 cm.Spanish and English.English translation by Ruth Gore.Includes indexes.}, pages = {31-53}, publisher = {F.O. Patthey}, organization = {F.O. Patthey}, edition = {1a}, address = {Barcelona}, keywords = {Colca River Valley (Arequipa, Peru) Description and travel., Peru) Pictorial works.}, isbn = {8440404433}, author = {Parodi, Alberto}, editor = {Roma{\~n}a, Mauricio de and Blassi, Jaime and Blassi, Jorge} }