000 003090000a22001450004500
245 _aNavigation
100 _aGardner, A.C.
250 _a2d ed.
260 _aLondon
_bE.U.P.
_c1973
300 _a208 p., ill.
440 _aTeach Yourself Books
080 _a656.6.052
_bG3
041 _aEN
942 _cBK
999 _c95960
_d95960