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  1. 1

    Secret hydrographic surveys in the Spratly islands by Hancox

    Published 1997
    Book
  2. 2

    Secret hydrographic surveys in the Spratly Islands by HancoxlhDavid

    Book
  3. 3

    Elements of hydrographic surveying by Logan, George Wood

    Published 1911
    Book
  4. 4