Secret Hydrographic Surveys in the Spratly Islands
References
^ Victor Prescott, David R. HancoxSecret Hydrographic Surveys in the Spratly Islands by Victor Prescott and David R. Hancox (1999, Hardcover) ISBN 9781901919080 (revised Apr 2015)^ David HancoxSecret Hydrographic Surveys in the Spratly Islands, Coronet Books Inc.. Amazon. ISBN 9781901919080 (revised Apr 2015)
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