The listing, Amateur Radio Cards has ended.
A QSL card or amateur radio card is a written confirmation between two amateur radio stations or a two-way radio communication.
They were sent through the mail like a postcard to acknowledge reception. The card included callsign, frequency, date, etc.
These cards are dated between 1949-1950. There are 9 cards. They are from Delaware, Utah, Colorado, Oklahoma, and Texas.
The original postage is still on the cards.