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I used them to write to a short wave radio station, so they send a QSL card. https://en.wikipedia.org/wiki/QSL_card https://en.wikipedia.org/wiki/QSL_card
by sbassi 2y ago
I used them to write to a short wave radio station, so they send a QSL card. https://en.wikipedia.org/wiki/QSL_card https://en.wikipedia.org/wiki/QSL_card