| Covers listed |
|
| 1965: | October/November, December, |
| 1966: | February, March, April, May, June, July, Vol 1 # 3August, September, October, November, December, |
| 1967: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1968: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1969: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1970: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1971: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1972: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1973: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1974: | January, February, March, April, May, June, July, August, September, October, November, Vol 10 # 1December, |
| 1975: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1976: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1977: | January, February, March, April, May, June, July, August, September, October, November, |
| 1978: | Dec.'77/January, February, March, April, May, June, July, August, September, October, November, |
| 1979: | January, March, May, July, September, November, |
| 1980: | January, March, May, July, September, November, |
| 1981: | January, March, May, July, September, November, |
| 1982: | January, March, May, July, October, December, |
| 1983: | February, March/April, July, September, October, |
