Monthly update #0017 • September 1991
Monthly update 17 • September 1991 • 1991-09-01 - 1991-09-30
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Monthly update #0016 • August 1991
Monthly update 16 • August 1991 • 1991-08-01 - 1991-08-31
Monthly update #0015 • July 1991
Monthly update 15 • July 1991 • 1991-07-01 - 1991-07-31
Monthly update #0014 • June 1991
Monthly update 14 • June 1991 • 1991-06-01 - 1991-06-30
Monthly update #0013 • May 1991
Monthly update 13 • May 1991 • 1991-05-01 - 1991-05-31
Monthly update #0012 • April 1991
Monthly update 12 • April 1991 • 1991-04-01 - 1991-04-30
Monthly update #0011 • March 1991
Monthly update 11 • March 1991 • 1991-03-01 - 1991-03-31
Monthly update #0010 • February 1991
Monthly update 10 • February 1991 • 1991-02-01 - 1991-02-28
Monthly update #0009 • January 1991
Monthly update 9 • January 1991 • 1991-01-01 - 1991-01-31
Monthly update #0008 • December 1990
Monthly update 8 • December 1990 • 1990-12-01 - 1990-12-31
Monthly update #0007 • November 1990
Monthly update 7 • November 1990 • 1990-11-01 - 1990-11-30
Monthly update #0006 • October 1990
Monthly update 6 • October 1990 • 1990-10-01 - 1990-10-31
Monthly update #0005 • September 1990
Monthly update 5 • September 1990 • 1990-09-01 - 1990-09-30
Monthly update #0004 • August 1990
Monthly update 4 • August 1990 • 1990-08-01 - 1990-08-31
Monthly update #0003 • July 1990
Monthly update 3 • July 1990 • 1990-07-01 - 1990-07-31
Monthly update #0002 • June 1990
Monthly update 2 • June 1990 • 1990-06-01 - 1990-06-30
Monthly update #0001 • May 1990
Monthly update 1 • May 1990 • 1990-05-01 - 1990-05-31