Unknown2019-03-052019-03-051953EPM-072-07-023http://hdl.handle.net/20.500.11867/15708Single 8.5 x 11 inch. Typed recto and verso.Includes data from 1935 through 1952. Three charts are included; one is maintenance cost per mile, one is highway maintenance and operation cost index, and the last is cost trends. The last was published by the Bureau of Public Roads.Statistical data