Standard specifications for road and bridge construction.

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Item Link Original Source
Limited (search only)   1938 University of Illinois at Urbana-Champaign
Limited (search only)   1948 University of Illinois at Urbana-Champaign
Limited (search only)   1956 University of Illinois at Urbana-Champaign
Limited (search only)   1960 sup. University of Illinois at Urbana-Champaign