| Covers listed |
|
| 1926: | January, April, May, June, July, |
| 1929: | July, |
| 1936: | May, October, November, |
| 1937: | June, |
| 1938: | May, |
| 1939: | January, April, July, August, September, November, |
| 1940: | May, June, |
| 1941: | January, May, July, |
| 1942: | July, August, October, November, |
| 1943: | January, March, April, May, July, August, September, October, November, December, |
| 1944: | January, December, |
| 1945: | February, April, May, July, August, October, November, |
| 1946: | March, April, May, July, August, September, October, November, December, |
| 1947: | January, March, May, June, August, September, November, December, |
| 1948: | February, April, October, December, |
| 1949: | January, May, June, July, August, September, November, |
| 1950: | March, October, November, December, |
| 1951: | January, April, May, August, September, November, |
| 1952: | July, August, November, |
| 1953: | November, December, |
| 1954: | January, February, March, April, May, June, |
| 1955: | May, June, |
| 1956: | February, May, August, December, |
| 1957: | April, June, September, October, November, |
| 1958: | April, May, June, July, |
| 1959: | February, April, June, July, August, December, |
| 1960: | February, October, December, |
| 1961: | February, |
| 1962: | January, May, |
