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https://www.bodc.ac.uk/resources/products/software/carters_tables/
Download the Echo-Sounding Correction Table software from BODC
Download the Echo-Sounding Correction Tables - Carter's tables (3rd Edition) from the British Oceanographic Data Centre (BODC)
the echodownloadsoundingcorrectiontable
https://www.fws.gov/press-release/1944-03/tests-echo-sounding-devices-locating-schools-fish-planned-west-coast-march-9
Tests Of Echo-sounding Devices In Locating Schools Of Fish Planned For The West Coast -- March 9,...
echo soundingtestsdeviceslocatingschools