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Start Over You searched for: Catalog Issue Year Decade 1950 - 1959 Remove constraint Catalog Issue Year Decade: 1950 - 1959 Sudoc Stem C 37.2 Remove constraint Sudoc Stem: C 37.2

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21. Traffic speed trends.

22. Highway Statistics, 1951.

23. Highway statistics, 1952.

26. Highway statistics, 1950.

27. Traffic speed trends.

28. Traffic speed trends.

30. Highway statistics, 1949.