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1951
Traffic surveys by post cards

Highway Research Board Bulletin, Issue 41, 30p

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1951
CONTROLLED POST CARD SURVEYS IN OHIO

Highway Research Board Bulletin, Issue 41, pp 1-20

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1951
ORIGIN AND DESTINATION SURVEYS IN WEST VIRGINIA BY POST CARD QUESTIONNAIRES

Highway Research Board Bulletin, Issue 41, pp 21-24

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1951
NEW YORK STATE TRAFFIC-PLANNING AND ORIGIN- DESTINATION SURVEYS FOR URBAN ARTERIAL ROUTES

Highway Research Board Bulletin, Issue 41, pp 25-29

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