- The copper and bronze ages in South America
- Entre cumbres y selvas. Primeros viajes a los Andes, el Chaco y la Amazonia (1901-1905)
- Deductions suggested by the geographical distribution of some post-Columbian words used by the Indians of S. America
- Modifications in Indian Culture Through Inventions and Loans
- Indianerleben Im Gran-Chaco








