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Start Over You searched for: Collections World War 2, 1939-1949 Remove constraint Collections: World War 2, 1939-1949 Authors Hatch, Theodore F., author Remove constraint Authors: Hatch, Theodore F., author

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1. Fourth partial report on Project no. 37 -- study of errors in field artillery practice: subject: an analysis of the sources of error in the use of the aiming circle and development of an improved instrument

7. Third partial report on Project no. 37 -- study of errors in field artillery practice: subject: analysis of requirements for eliminating errors in laying guns in elevation

10. Second partial report on Project no. 37 -- study of errors in field artillery practice: subject: an analysis of the sources of error in the use of the panoramic telescope M12 and development of principles of design for an improved instrument