These Z-Letter issues were scanned in 300dpi Black and White.

  Z-Catalog Z-System Software Catalog. Jan 1989, 16 pages
Z-Letter #1 September 1988, 32 pages
Z-Letter #3 February 1989, 44 pages
Z-Letter #4 August 1989, 20 pages
Z-Letter #5 November 1989, 52 pages

	These Z-Letter issues were scanned in 600dpi Black and White.

Z-Letter #1 September 1988, 32 pages
Z-Letter #2 October 1988, 36 pages
Z-Letter #3 February 1989, 44 pages
Z-Letter #4 August 1989, 20 pages
Z-Letter #5 November 1989, 52 pages
Z-Letter #6 May 1990, 28pages
Z-Letter #7 November 1990, 26 pages
Z-Letter #8 December 1990, 34 pages
Z-Letter #9 February 1991, 32 pages
Z-Letter #10 March 1991, 30 pages
Z-Letter #11 April 1991, 28 pages
Z-Letter #12 May 1991, 40 pages
Z-Letter #13 June 1991, 36 pages
Z-Letter #14 August 1991, 28 pages
Z-Letter #15 September 1991, 44 pages
Z-Letter #16 October 1991, 34 pages
Z-Letter #17 November 1991, 40 pages
Z-Letter #18 February 1992, 38 pages
Z-Letter #19 March 1992, 40 pages
Z-Letter #20 April/May 1992 20 pages
Z-Letter #21 June/July 1992, 18 pages
Z-Letter #22 August/September 1992, 20 pages
Z-Letter #23 January/February 1993, 18 pages
Z-Letter #26 July/August 1993, 20 pages
Z-Letter #27 September/October 1993, 20 pages
Z-Letter #28 November/December 1993, 20 pages
Z-Letter #29 January/February 1994, 20 pages
Z-Letter #30 March/April 1994, 20 pages
Z-Letter #31 May/June 1994, 24 pages
Z-Letter #35 January/February 1995, 24 pages
Z-Letter #36 March/April 1995, 36 pages
Z-Letter #37 May/June 1995, 20 pages
Z-Letter #38 July/August 1995, 20 pages
Z-Letter #39 September/October 1995, 20 pages
Z-Letter #40 November/December 1995, 30 pages
Z-Letter #41 January/April 1996, 22 pages