Abstract
The June article says there is no correlation as well as the July article sees some correlation according to resp. a Michigan and a Washington report.
The June article says there is no correlation as well as the July article sees some correlation according to resp. a Michigan and a Washington report.
Traffic Digest and Review, Vol. 15 (1967), No. 6 (June), p. 2 / Traffic Digest and Review, Vol. 15 (1967), No. 7 (July), p. 2
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