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040 _aPBRU
082 0 4 _a627
_bR643U.
100 1 _aRoberts, Larry S.
_927845
245 1 4 _aThe underwater world of sport diving instructor's manual.
260 _aSt.Louis :
_bMosy-Year Book,
_c1991
300 _a37 P. ;
_billus
650 4 _aDiving.
_938958
650 4 _aUnderwater Exploration.
_936434
942 _c1
999 _c13875
_d13875