La Travesía de los Andes en Globo.

First-person account of the first balloon crossing of the Andes, Santiago to Uspallata, June 24, 1916, closer to a flight diary than a polished narrative. Illustrated throughout by Bradley with his own diagrams, including a fold-out map of the route and a profile chart of the peaks the balloon cleared. First and only edition; no later printing or reissue recorded. Three exemplars in the collection, identical apart from condition.