Cover title. "U.S. Geological Survey"--1st prelim. p. "Final report." "December 1981." Bibliography: p. 109-110. Contract no.: 5-3-0195. "Report no. FHWA/RD-82/016."
OCLC:
(OCoLC)44387999
Locations:
OVUX522 -- University of Iowa Libraries (Iowa City)
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