Basic methods for the calibration of sonar equipment United States. National Defense Research Committee. creator United States. Office of Scientific Research and Development. National Defense Research Committee. creator text book Washington, D.C 1946 1946
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ENG Scientific Research and Development Summary Report. Division 6, v. 10 https://www.biodiversitylibrary.org/bibliography/38766 6686536 10.5962/bhl.title.38766 NcD