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Water Testing, 1943

Inspection of Outdoor Toilet, 1943

Water pollution control plant, 1940

Water pollution control plant, 1940

Sewage disposal plant tablets at entrance, 1942

Sewage disposal plant, 1942

Sewage disposal plant and sludge beds, 1942

Sewage treatment plant primary settling tanks, 1942

Sewage disposal plant sludge digestion tank, 1942

Sewage disposal plant sludge drying beds, 1942

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