National Directory of Commodity Specifications: Classified ...
United States. National Bureau of Standards
Pennsylvania, State Highway Dept., Form 408, 1922: Watering troughs. 518.75 Reservoirs *National Bd. of Fire Underwriters, 1919: Concrete reservoirs. ( Indorse A. S. T. M. Spec. for Portland cement; A. R. E. A. Spec. for steel reinforcement.) ...