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If there are any, could there be many?

Nature's Christmas issue a year ago carried an article entitled ‘Naming the Loch Ness monster’. This year, Carl Sagan writes on ‘Detection times and number densities of rare mobile organisms: application to Loch Ness’.


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    Mackal, R. P., Monsters of Loch Ness (The Swallow Press, Chicago, Illinois, 1976).

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    Sheldon, R. W., and Kerr, S. R., Limnol. Oceanogr., 17, 796 (1972). Scheider, W., and Wallis, P., Ibid. 18, 343 (1973).

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    Wyckoft, C. W., Private communication (1976).

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