Volume 20 Number 1 — January 1979
Volume 20 Number 2 — February 1979
Volume 20 Number 3— March 1979
Volume 20 Number 4 — April 1979
Volume 20 Number 5 — May 1979
Volume 20 Number 6 — June 1979
Volume 20 Number 7 — July 1979
Volume 20 Number 8 — August 1979
Volume 20 Number 9 — August 1979
Volume 20 Number 10 — October 1979
Volume 20 Number 11 — November 1979
Volume 20 Number 12 — December 1979
Volume 20 Complete Set