pl23_theb3802.jpg
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https://www.noaa.gov/media/digital-library-photo/pl23theb3802jpg-0Description
LL type wireline sounding machine.C&GS; 1942 Hydrographic Manual
Credit
NOAA Central Library
Collection
Historic Coast & Geodetic Survey
Nautical Charting
Bathymetry - Mapping the Features
Pre-1920
Keywords
Charting
Soundings
Bathymetry
Mechanical