Ancient monuments of the Mississippi Valley

Inca Land

Lost City of the Incas

The Journal of an Expedition Across Venezuela and Colombia, 1906-1907

Across South America; An Account of a Journey from Buenos Aires to Lima by Way of Potosí, with Notes on Brazil, Argentina, Bolivia, Chile, and Peru

Across South America

The Ruins Of Espiritu Pampa, Peru

Vitcos

An explorer in the air service

The Monroe doctrine, an obsolete shibboleth

Across South America