No.	Title	Date
1	1969-12-15 Hourglass
2	1970-01-26 Hourglass
3	1970-03-04 Hourglass
4	1970-04-22 Hourglass
5	1970-05-11 Hourglass
6	1970-09-18 Hourglass
7	1970-10-02 Hourglass
8	1970-10-16 Hourglass
9	1970-10-30 Hourglass
10	1970-11-13 Hourglass
11	1970-11-30 Hourglass
12	1970-11-30 Hourglass Special Issue
13	1970-12-11 Hourglass
14	1971-01-19 Hourglass
15	1971-01-29 Hourglass
16	1971-02-05 Hourglass
17	1971-02-19 Hourglass
18	1971-03-05 Hourglass
19	1971-03-29 Hourglass
20	1971-05-07 Hourglass