Human impact on mountainsNigel J. R. Allan, Gregory W. Knapp, Christoph Stadel · First published 1988 · Latest edition 1993Open the Tome
Riego precolonial y tradicional en la sierra norte del EcuadorGregory W. Knapp · First published 1992Open the Tome
Linguistic and cultural geography of contemporary PeruGregory W. Knapp · First published 1987Open the Tome