July 1991 Vol. 15, No. 1 12 1,799k July 1991 Vol. 15, No. 2 8 1,235k August 1991 Vol. 15, No. 3 8 1,365k August 1991 Vol. 15, No. 4 8 1,315k August 1991 Vol. 15, No. 5 8 1,249k August 1991 Vol. 15, No. 6 missing ?? (missing) August 1991 Vol. 15, No. 7 8 1,151k August 1991 Vol. 15, No. 8 12 1,796k August 1991 Vol. 15, No. 9 12 1,862k August 1991 Vol. 15, No. 10 8 1,469k August 1991 Vol. 15, No. 11 8 1,939k August 1991 Vol. 15, No. 12 8 1,436k August 1991 Vol. 15, No. 13 8 1,212k