notes: two roles plus document "Start of Dredging Program" which identifies planned dredge station and steps of the dredging operation dredge (instrument)
subjects: Echo sounding.
related subjects: R/V Knorr
related subjects: swath mapping of southwest indian ridge
geographic coverage: southwest indian ridge, 52?3.8?s 16? e
Dick, John Henry [dla:4df552e8-061b-11e1-8e4e-0026b97a63fb]