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Start Over You searched for: Catalog Issue Year Decade 1930 - 1939 Remove constraint Catalog Issue Year Decade: 1930 - 1939 Sudoc Stem C 4.2 Remove constraint Sudoc Stem: C 4.2

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33. Leveling. First-order leveling.

34. Triangulation, Triangulation.

35. Distances between United States ports.