980 resultados para Page, Harlan, 1791-1834.
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Signatur des Originals: S 36/F09315
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Signatur des Originals: S 36/F09329
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Signatur des Originals: S 36/F09341
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Signatur des Originals: S 36/F10977
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Signatur des Originals: S 36/G12630
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gehalten von L. Bodenheimer
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Two types of deep-sea dredges are currently under development for the mining of the manganese nodules, a deep-sea hydraulic dredge and a mechanical cable-bucket system. Both systems offer some advantages with the hydraulic system appearing to be advantageous in themining of a specific deposit for which it is designed while the cable-bucket system appears to be somewhat more flexible in working in a variety of deposits, topographic environments, and water depths. Environmental studies conducted in conjunction with deep-sea tests of the two types of mining systems currently indicate that substantially no environmental damage will be done in the mining of the deep-sea nodules. Because of the nature of the deposits and the way in which they can be mined, the manganese nodules appear to be a relatively pollution free and energy-saving source of a number of industrially important metals.
Meteorological observations during La Diana cruise from La Coruña to La Habana started at 1791-08-06
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Manganese nodules containing up to 22 percent manganese oxide were found in Green Bay and the western and northern parts of Lake Michigan. The chemical composition of these nodules resembles that of shallow-water lacustrine and marine nodules. The manganese content of interstitial water is in some places enriched as much as 4000 times over that of lake water.