Control Of Ready-Mixed Concrete / R. C. Blankenship, Engineer, Portland Cement Association, St. Louis -- Admixtures / George Southworth, Master Builders Company, Kansas City -- Lightweight Aggregates And Concrete / Daniel P. Jenny, Chief Engineer, Expanded Shale, Slate And Clay Institute, Washington, D. C. -- Special Problems Of Concreting / Robert Brown, Production Vice President, Concrete Materials Company, Kansas City -- The Problems Of Processors Of Aggregate For Concrete / Henry Gish, Chief Engineer, Stewart Sand And Material Company, Kansas City -- Testing Aggregates And Concrete / V. B. Saville, Engineer Of Materials, Missouri State Highway Department, Jefferson City