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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Sagan, C. If there are any, could there be many?. Nature 264, 497 (1976). https://doi.org/10.1038/264497a0

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