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|All Authors / Contributors:||
R A Crawford; D W Anderson; United States. Bureau of Public Roads.; South Dakota. Department of Highways.
|Notes:||In cooperation with the U.S. Bureau of Public Roads.
U.S. Bureau of Public Roads. R & D rport no. 1580.
PB 182 252.
|Description:||18 leaves illustrations|
|Responsibility:||[by] R.A. Crawford [and] D.W. Anderson.|