May 1991 Vol. 13, No. 1 ~ June 1991 Vol. 13, No. 13

May 1991	Vol. 13, No. 1	8	1,467k
May 1991	Vol. 13, No. 2	8	1,322k
May 1991	Vol. 13, No. 3	12	1,796k
May 1991	Vol. 13, No. 4	12	1,776k
May 1991	Vol. 13, No. 5	8	1,583k
May 1991	Vol. 13, No. 6	12	2,276k
May 1991	Vol. 13, No. 7	8	1,446k
May 1991	Vol. 13, No. 8	8	1,423k
May 1991	Vol. 13, No. 9	8	1,210k
June 1991	Vol. 13, No. 10	8	1,439k
June 1991	Vol. 13, No. 11	16	2,826k
June 1991	Vol. 13, No. 12	8	2,252k
June 1991	Vol. 13, No. 13	8	1,329k