Kliphuis asbestos mine, South Africa, 1955-1960.

SOUTH AFRICA - MAY 31: Photograph from the collection of pathologist Dr J C Wagner showing a group of women at the Kliphuis mine in Prieska, South Africa. The women are sorting blue asbestos rocks (crocidolite) before they are moved by trolley for bagging and transportation to the asbestos mill. Wagner's research, and that of his colleagues, led to the identification of the causal link between exposure to blue asbestos and the lung cancer mesothelioma. (Photo by SSPL/Getty Images)