1.   Title: "El Observatorio y Edificio Central: Ruinas de Monte Albán / Oaxaca, Oax. Mexico."
Institution: University of Regina Archives and Special Collections
Fonds/Collection: Theodore Allen Heinrich fonds
2.   Title: "3. Fahrt: Im Blutenparadies der Berstrasse."
Institution: University of Regina Archives and Special Collections
Fonds/Collection: Theodore Allen Heinrich fonds