https://spreadsheets.google.com/ccc?key=0AoX8tpb0l73sdHY5TnlaX1VGVE93RkZIbkdLQWk0Rmc&hl=en - various FD radio callsigns - USA
https://docs.google.com/Doc?docid=0AYX8tpb0l73sZGhtamZ6anBfMzRnM2ZqcDVjdg&hl=en - Massachusetts radio IDs