Here are the links to the Groundsheets published in the 1980s.

Vol 29 No 1 – Jan-Feb 1980

Vol 29 No 2 – Mar-Apr 1980

Vol 29 No 3 – Jul-Aug 1980

Vol 29 No 4 – Sep-Oct 1980

Vol 29 No 5 – Nov-Dec 1980

Vol 30 No 1 – Jan-Feb 1981

Vol 30 No 2 – Mar-Apr 1981

Vol 30 No 3 – May-Jun 1981

Vol 30 No 4 – Sep-Oct 1981

Vol 31 No 1 – Jan-Feb 1982

Vol 31 No 2 – Mar-Apr 1982

Vol 31 No 3 – Jul-Aug 1982

Vol 31 No 4 – Sep-Oct 1982

Vol 32 No 1 – Jan-Feb 1983

Vol 32 No 3 – Jun-Jul 1983

Vol 32 No 4 – Sep-Oct 1983

Vol 32 No 5 – Nov-Dec 1983

Vol 33 No 1 – Jan-Feb 1984

Vol 33 No 2 – Mar-Apr 1984

Vol 33 – August 1984

Vol 33 – Oct-Nov 1984

Vol 34 Iss 2 – April 1985

Vol 34 Iss 3 – 1985

Vol 34 Iss 4 – October 1985

Vol 34 Iss 5 – December 1985

Vol 35 Iss 1 – February 1986

Vol 35 Iss 2 – Apr-May 1986

Vol 35 Iss 3 – Oct-Nov 1986

Vol 35 Iss 4 – February 1987

Vol 35 Iss 5 – May-Jun 1987

Souvenir Iss – October 1987

Vol 35 Iss 6 – Oct-Nov 1987

Vol 36 Iss 1 – Feb-Mar 1988

Vol 36 Iss 2 – Apr-May 1988

Vol 36 Iss 3 – 1988

Vol 37 Iss 1 – 1989

Vol 37 Iss 2 – 1989

Vol 37 Iss 3 – Oct-Nov 1989

Missing Editions
Volume 31 No 5
Volume 32 No 2
Volume 34 No 1 and 3
Volume 36 No 4
Volume 38 No 3