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Start Over You searched for: Subjects Weapons Remove constraint Subjects: Weapons Subjects Equipment and Supplies Remove constraint Subjects: Equipment and Supplies Titles 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 Remove constraint Titles: 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 Genre Technical Report Remove constraint Genre: Technical Report Dates by Range 1900-1949 Remove constraint Dates by Range: 1900-1949

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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