000 00308nam a2200121 4500
008 160616s 000 0
245 _aRadio wave propagation and the ionosphere, 2 vols
100 _aAlpert, Yakov L
500 _aC5:8M6 L3.1 L3.2
942 _cBK
_2BK9204
080 _a538 ALP
080 _a538 ALP
999 _c9204
_d9204