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200 1 $aMariner's gyro-navigation manual$efor masters, mates, marine engineers and potential ship's officers$fby Walter J. O'Hara
210   $aCambridge (Md.)$cCornell Maritime Press$d1951
215   $aXVIII, 162 p.$cill.$d22 cm
500 10$aMariner's gyro-navigation manual$944326
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700  1$aO'Hara,$bWalter J.$0633341
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996   $aMariner's gyro-navigation manual$944326
997   $aUNIPARTHENOPE