Krizek, Raymond J. text Washington] Highway Research Board, National Research Council 1971 monographic 155 p. illus. 28 cm. [by] Raymond J. Krizek [and others. "Research sponsored by the American Association of State Highway Officials in cooperation with the Federal Highway Administration." NCHRP project 15-3 FY '68. 0 0 0 625_734200000000000_STR Culverts MCE Pipe 625.7342 STR 0309019060