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  1. 1
    The induction conductivity indicator : a new method for conductivity measurement at sea /
    by Esterson, Gerald L.
    Published 1957
    Book
  2. 2
    The Chesapeake Bay Institute conductivity-temperature-indicator (CBI-CTI) /
    by Schiemer, E. W. (Edmund W.)
    Published 1957
    Book
  3. 3
    The meaningful use of the Secchi disc /
    by Williams, Jerome, 1926-
    Published 1968
    Book
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