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Author: Helfrich, Philip; Piyakarnchana, Twesukdi; Miles, Phillip S.
Year: 1968
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Author: Kohn, Alan J.; Helfrich, Philip
Call no: RP12808
Year: 1957
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Author: Helfrich, Philip; University of Hawaii. Sea Grant Program
Call no: 639.5430964 HEL
Year: 1973
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