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This photo is of Roberth G. Unruh explaining desirable traits of a laying hen to highschool students in the Paraguayan Chaco. Unruh worked as a development worker in the areas of agriculture and stock-breeding in the Mennonite colonies in the Paraguayan Chaco from 1951 to 1983.

This photo is of Robert Unruh explaining traits of good beef cattle at a field day at the Experimental Farm near Filadelfia, Fernheim Colony. Unruh worked as a development worker in the fields of agriculture and cattle-raising in the Mennonite colonies in the Paraguayan Chaco from 1951 to 1983. Used in the book" Garden in the Wilderness", by Edgar Stoesz p. 95.

This photo is of a group of white oil company workers meeting a group of Ayoreo First Nations, which at that point lived in the wilderness, isolated from civilization.

This photo is of Robert G. Unruh and Heinrich Duerksen, Oberschulze of the Fernheim Colony, at the Experiment Farm near Filadelfia, Fernheim Colony, discussing the results of one day tomatoe picking. Unruh worked as development helper in the areas of agriculture and cattle raising in the Mennonite colonies in the Paraguayan Chaco from 1951 to 1983.