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Start Over You searched for: Formats Text ✖Remove constraint Formats: Text Collections World War 2, 1939-1949 ✖Remove constraint Collections: World War 2, 1939-1949 Subjects Motor Vehicles ✖Remove constraint Subjects: Motor Vehicles Subjects United States ✖Remove constraint Subjects: United States Subjects Air Pollutants, Occupational ✖Remove constraint Subjects: Air Pollutants, Occupational Subjects World War II ✖Remove constraint Subjects: World War II Authors Walpole, Robert H., author ✖Remove constraint Authors: Walpole, Robert H., author Authors Eichna, Ludwig W. (Ludwig Waldemar), 1908- author ✖Remove constraint Authors: Eichna, Ludwig W. (Ludwig Waldemar), 1908- author Authors Hatch, Theodore F., author ✖Remove constraint Authors: Hatch, Theodore F., author Dates by Range 1900-1949 ✖Remove constraint Dates by Range: 1900-1949