Standard specifications for road and bridge construction.
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Item Link | Original Source |
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Limited (search only) 1941 | University of Illinois at Urbana-Champaign |
Limited (search only) 1950 | University of Illinois at Urbana-Champaign |
Limited (search only) 1957 | University of Illinois at Urbana-Champaign |
Limited (search only) 1967 | University of Illinois at Urbana-Champaign |