The Gran Chaco War: Fighting for Mirages in the Foothills of the Andes
- Fighting began in 1928, when Bolivia tried to establish an outlet to the sea via the Paraguay River. Includes several images.
- http://worldatwar.net/chandelle/v1/v1n3/chaco.html

The Chaco War
- Dispute between Bolivia and Paraguay. Both landlocked countries sought an expansion of territory in an effort to gain better access to the Paraguay river.
- http://www.american.edu/projects/mandala/TED/ice/chaco.htm