Highway lighting needs study : final report, prepared for Pennsylvania Department of Transportation, Agreement nos.42551 and 42551-A

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245 0 0 ‡aHighway lighting needs study : ‡bfinal report, prepared for Pennsylvania Department of Transportation, Agreement nos.42551 and 42551-A / ‡cPennsylvania State University. Pennsylvania Transportation and Trafic Safety Center.
260 ‡c1970.
500 ‡aFOR FURTHER BIBLIOGRAPHIC INFORMATION SEE CARD CATALOG IN THE TRANSPORTATION LIBRARY.
538 ‡aMode of access: Internet.
710 2 0 ‡aPennsylvania Transportation and Traffic Safety Center.
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