HYDROGRAPHY FOR CHARTING - SOUNDING DRAGGING
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✎ Suggest a correctionDescribes the methods of determining the depth of water and the instrumentation required. Also explains to guarantee obstruction-free depth of water. The equipment and techniques employed in wire dragging.
Sources
- usgov-av-1974 — title, year, creator, length, color, sound, description
Record added 2026-07-01 03:45:49 · Suggest a correction