Photograph. "Big digester tanks, each with a capacity of two and a half million gallons, are under construction at the Hyperion sewage project. They will hold sludge taken from sewage to be made into by-products. Bond issue is needed to complete project." -- Examiner clipping attached to verso, dated 29 October 1948. "Gas from these tanks will help run the giant power house. More than 100,000 tons of fertilizer a year will be made and sold when the plant is in full operation. There will be 18 such tanks." from a typed note attached to verso.