Lot of 50 1930s-40s Amateur Radio Carding Cards with Stamp

Lot of 50 ) 1930s-40s Amateur Radio , Ham Radio Carding Cards with Stamps , all appear to be sent from different parts of the UNITED STATES and sent to Sussex N.B. Most in good condition with light wear on the corners .Cards measure 3 1/4 by 5 1/2 inches .