Hello,
I'm a stamp collector that likes unusual postal history items. I
bought these recently and put a page of them together starting back in
the early thirties. When did the cards start?
It may be interesting for radio enthusiasts to view.
Here is a selection of QSL cards:
index only
http://cover.home.mindspring.com/collection/qsl2.html
5 mb of all of them:
http://cover.home.mindspring.com/collection/qsl.html
take note of the russian zeppellin or flying saucer towards the end.
they are sort of in alphabetical order.
TL