here a recording from 1971,
unfortunately with some tape recorder problems... (rb)
this recording identifies the site as 'Dixon' instead of 'Oakland'.
Sorry for the poor quality, but that is shortwave ;-) (rb, 1973)
here the standard AT&T QSL card (rb, 1973)
------------------------------------------------------------
Callsigns:
WMA **
WMB **
WMC **
WMD **
Frequencies Voice:
9170
10597.5
10790
13370
13400
14748
14793
17610
18240
18270
18587
18755
19798
Frequencies Radioteletype:
14590
Systems used:
50 Bd