1 | DDDX | Frontier Cooperative Co. | added 4/1991; eliminated 10/1992; 1/1994-7/2005 (not listed) | | NAKINA |
2 | DDDX | Frontier Cooperative Co. | added 4/91; eliminated 10/92; 1/94-7/2000 | | NRHS |
3 | DDDX | FRONTIER COOPERATIVE COMPANY [RETIRED 11-30-92 ATP] | | | PWRC |
4 | DDDX | Frontier Cooperative | | | RSRV |