| Covers listed |
|
| 1948: | May, June, July, August, September, October, November, December, |
| 1949: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1950: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1951: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1952: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1953: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1954: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1955: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1956: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1957: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1958: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1959: | January, February, March, April, May, June, July, August, September, October, November, December, Annual, |
| 1960: | January, February, March, April, May, June, July, August, September, October, November, December, AnnualDecember, |
| 1961: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1962: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1963: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1964: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1965: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1966: | January, February, March, April, May, June, July, August, 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, December, |
| 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, December, |
| 1978: | January, February, March, April, May, June, July, August, September, October, November, |
| 1979: | January, March, May, July, September, |
