Aggregate gradation for highways : Aggregate gradation, simplification, standardization and uniform application; and, A new graphical chart for evaluating aggregate gradation. - Washington : U.S. Govt. Print Off., 1962. - 26 p. : ill. ; 26 cm. Subjects--Topical Terms: Aggregates (Building materials)--Standards.MCERoad materials--Standards. Dewey Class. No.: 625.7 / BUR