Andes

Free to read here, from Project Gutenberg.

The Andes and the Amazon; Or, Across the Continent of South America

James Orton, also an audiobook

Across the Andes

Charles Johnson Post, also an audiobook

Vagabonding down the Andes

Harry Alverson Franck

Under the Andes

Rex Stout, also an audiobook

The Rover of the Andes: A Tale of Adventure on South America

R. M. Ballantyne

Secrets of the Andes

James H. Foster

The face in the abyss

Abraham Merritt

The Flying Machine Boys in the Wilds; Or, The Mystery of the Andes

Frank Walton

All That Earthly Remains

C. C. MacApp

Hochtouren im tropischen Amerika

Hans Meyer

German