Highway research circular.

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Item Link Original Source
Limited (search only)   no.1-30 1965 University of Michigan
Limited (search only)   no.32-60 University of Michigan
Limited (search only)   no.61-86 1967 University of Michigan
Limited (search only)   no.87-119 1968 University of Michigan
Limited (search only)   no.120-150 University of Michigan
Limited (search only)   1965/66 no.1-40 University of Colorado Boulder
Limited (search only)   1966 no.41-59 University of Colorado Boulder
Limited (search only)   1967 no.60-72 University of Colorado Boulder