(radio call sign) was referred to in the liner notes of (British) KRAZY KAT LP #KK 7426, and may refer to a radio station at Villa Acuña, Coahuila, Mexico, which was active between 1935 and 1939, opposite Del Rio, Texas: Tony Russell, facebook group The Real Blues Forum, 25 October 2019. Alternatively it may be an earlier call sign for AM radio station X E R F.