00409nam a2200145 a 4500008004100000020001500041050001600056100001900072245006300091260003000154300002300184350000900207650002000216650002700236120416s1987    ||||||||||||||||| ||    u  a0863410995  aTK 6553 Pro  aKerr, Donald E10aPropagation of short radio wavescedited by Donald E. Kerr  aLondon:bPeregrinusc1987  axvii, 737p. : ill.  a0.00  aSHORTWAVE RADIO  aRADIO WAVE PROPAGATION