
1) Backwoods mail rtes 2) Backwoods rtes 3) Bucolic mail rtes 4) Certain postal addresses 5) Country mail rtes 6) Country-mail rtes 7) Farm country mail rtes 8) Farm-area mail rtes 9) Mail rtes 10) Mayberry, et al 11) Old mail rtes 12) Old USPS 13) Old-time postal rtes 14) Outlying mail rtes 15) Royal flying doctor service
Found on
https://www.crosswordclues.com/clue/rfds

Royal Flying Doctor Service
Found on
http://www.encyclo.co.uk/local/20895
No exact match found.