000 00373 a2200145 4500
082 _a621.384
_bLEN
090 _c24562
_d40540
100 _aLenk, John D.
245 _aElectronic navigation
_bmade easy
260 _aNew York
_bJohn F. Rider publisher
_c1964
_g1964
300 _aviii, 167p.
_c21cm.
650 _aNavigation
650 _aElectronic Engineering
942 _cL
999 _c51648
_d51648