Pittsburgh, PA: Clay Sewer Pipe Association, 1941. First edition. Staplebound Wraps. 12 Mo (5 x 8), pp. 53, indexed, illustrated w/ drawings. Very Good, peeling lamination around cover edges, interior Near Fine. Item #7285
To avoid complex computations reegarding loads falling on clay pipes, the Clay Sewer Pipe Association developed tables "including solutions for practically all normal sewer and drain trench loading problems."