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*24500$aTraffic control devices and rail-highway crossings
*260  $aWashington, D.C.$bTransportation Research Board, National Research Council$c1985
*300  $aV, 122 s.$bill.
*4901 $aTransportation research record$v1010
*830 0$aTransportation research record (trykt utg.)$x0361-1981$v1010$w998711352484702201$_21195500
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*999  $aoai:nb.bibsys.no:991020951404702202$b2021-11-14T20:33:13Z$z991020951404702202
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