New Hydrographic Apparatus
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Kaare MΓΌnster StrΓΆm
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Article
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1931
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John Wiley and Sons
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English
β 335 KB
## With 3 figures. 1. Plankton Catcher. Though the disadvantages of nets for quantitative catches of planktic metazoa have long been agreed upon, they are still the only implements in general use. In freshwater and coastal waters the pump method is sometimes resorted to, but the inherent disadvant