"Amity sluice gates"
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On envelope: "Amity sluice gates 1910 - S. G. Porter, Holly". Images include construction workers in camp, pumping of water, formwork and pouring of concrete, canal headgate, construction equipment, and workers constructing Amity Canal's sluice gates. S. G. Porter was chief engineer of the Arkansas Valley Sugar Beet and Irrigated Land Company in 1910.