Above is a letter sent by S. W. Edwards, Supervisor of Radio in the 8th Radio District, headquartered in Detroit, notifying his superiors that WMAC's broadcast licence had expired and since the licencee showed no signs of renewing it, the station should be deleted. In this case WMAC apparently acted fast enough to avoid deletion, as there is no report in the Radio Service Bulletin of it being deleted at this time. (A couple of years later Clive Meredith started WSYR in Syracuse, NY. At first WMAC and WSYR shared time, but soon the two stations were consolidated, as WSYR-WMAC. Later the station became WSYR-WSYU. Finally the WSYU call--and all remaining traces of WMAC--was dropped from the dual callsign).
This example came from the station's licence file at the National Archives in Suitland, MD. However, this sort of correspondence is not normally included with the station licences.