Caption accompanying top left photograph: Re-facing of the canal banks with mud and clay during winter closure. Egypt c. 1935.

Caption accompanying top right photograph: Clearing and aligning of canal banks with mattocks. Egypt c. 1938.

Caption accompanying bottom left photograph: First weeding of canal, showing the excessive weed growth. Egypt c. 1935-1938.

Caption accompanying bottom right photograph: Final dipping for snails in cleared section of canal prior to cutting cofferdam in foreground. Egypt c. 1938.

Egypt – Anti-Schistosomiasis Project, 1919-1964. Claude H. Barlow papers; Claude H. Barlow photographs – Series 1053; Rockefeller Archive Center.