| 31. | She conducted hydrographic surveys off Brest from 1864.
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| 32. | The research ships, which include hydrographic survey vessels, receive hull numbers beginning with " S ".
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| 33. | He participated in a preliminary hydrographic survey of Midway Island for a cable station in 1901.
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| 34. | The NOAA fleet provides hydrographic survey, Newport, Oregon.
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| 35. | Hydrographic surveys continued in the Caribbean until 1917, including operations in Panama, Nicaragua, Honduras, and Cuba.
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| 36. | Nautical charts are based on hydrographic surveys.
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| 37. | From 1885 to 1889 she performs various tasks in the de la Plata rivers, including hydrographic survey.
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| 38. | Oceanographic, seismographic and hydrographic surveys were completed after each nuclear blast was completed to further the data.
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| 39. | U . S . Coast and Geodetic Survey diagram of wire-drag hydrographic survey operations, ca . 1920.
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| 40. | The ship carried out an extensive hydrographic survey and diving operations in the area off the Tharangambadi coast.
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