What are the release dates for Guns of Fort Defiance - 1981 VG

Guns of Fort Defiance - 1981 VG was released on:

USA: 1981 (TRS-80 version)
USA: 1981 (Commodore PET version)
USA: 1981 (Commodore 64 version)
USA: 1981 (Atari 8-bit version)
USA: 1981 (Apple II version)