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This publication is one of a series which have been prepared for distribution at the General Assemblies of the Internationa1 Association of Geodesy. In addition to supplying the information required for the National Reports assembled by the Association, these publications have a historical value for geodesists in the United States. They provide a means of tracing the development of surveying methods and the extension of the control networks in this country. The first of these publications appeared as an Appendix to the Director's Report for 1889. In later years these reports on geodetic operations have been prepared as Special Publications of the Coast and Geodetic Survey. This report contains information describing the operations for tho 15-year period from January 1, 1939, to December 31, 1953. During that time there was an increasing interest in the use of geodetic control surveys with a corresponding acceleration in research and in the application of geodetic information to engineering projects. The technical advances made in all fields of science and engineering have required the use of the most modern instruments and methods for geodetic operations.