In the summer of 1919, Sawyer and his family moved to Brisbane, Australia, to head the Rockefeller Foundation's new hookworm control campaign there. Early in 1920 he spent several months visiting the campaign's regional sites and surveying other possible sites. Mining towns such as Broken Hill in western New South Wales were considered, because miners in other countries often suffered from hookworm. (This was not the case in Australia, as the mines were located in areas with low rainfall and dry soil.)
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