Volume 20 – January - June 1968
- Issue 1 (p1-38) -- 1 January 1968
- Issue 2 (p39-89) -- 8 January 1968
- Issue 3 (p91-136) -- 15 January 1968
- Issue 4 (p137-175) -- 22 January 1968
- Issue 5 (p177-238) -- 29 January 1968
- Issue 6 (p239-308) -- 5 February 1968
- Issue 7 (p309-356) -- 12 February 1968
- Issue 8 (p357-408) -- 19 February 1968
- Issue 9 (p409-479) -- 26 February 1968
- Issue 10 (p481-528) -- 4 March 1968
- Issue 11 (p529-574) -- 11 March 1968
- Issue 12 (p575-646) -- 18 March 1968
- Issue 13 (p647-701) -- 25 March 1968
- Issue 14 (p703-781) -- 1 April 1968
- Issue 15 (p783-825) -- 8 April 1968
- Issue 16 (p827-898) -- 15 April 1968
- Issue 17 (p899-977) -- 22 April 1968
- Issue 18 (p979-1020) -- 29 April 1968
- Issue 19 (p1021-1084) -- 6 May 1968
- Issue 20 (p1085-1135) -- 13 May 1968
- Issue 21 (p1137-1222) -- 20 May 1968
- Issue 22 (p1223-1277) -- 27 May 1968
- Issue 23 (p1279-1333) -- 3 June 1968
- Issue 24 (p1335-1417) -- 10 June 1968
- Issue 25 (p1419-1466) -- 17 June 1968
- Issue 26 (p1467-1550) -- 24 June 1968
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