000
00271nam a2200109 4500
008
160616s 000 0
245
_a
Radio wave propagation and the ionosphere
100
_a
Alpert, Ya L
500
_a
B9:95 K31
942
_c
BK
_2
BK10193
080
_a
523.4 ALP
999
_c
10193
_d
10193