| Covers listed |
|
| 1925: | #1 / December, |
| 1926: | June, |
| 1927: | September, November, |
| 1928: | March, August, |
| 1929: | January, June, August, |
| 1931: | April, May, June, July, August, |
| 1932: | June, November, |
| 1933: | January, August, December, |
| 1934: | May, July, |
| 1935: | March, April, Vol 19 # 4 - September, December, |
| 1936: | January, Vol 20 # 4 - March, May, August, September, October, |
| 1937: | January, February, April, May, June, July, August, September, October, November, December, |
| 1938: | January, March, April, May, June, July, August, September, November, December, |
| 1939: | January, February, March, April, June, July, August, September, October, November, December, |
| 1940: | January, March, April, June, August, September, October, November, December, |
| 1941: | January, February, March, July, August, September, October, November, December, |
| 1942: | January, February, March, April, May, June, October, November, December, |
| 1943: | January, February, March, April, July, August, November, December, |
| 1944: | January, Vol 36 # 5 - April, August, September, December, |
| 1945: | February, March, April, May, June, August, September, October, November, |
| 1946: | January, February, April, May, June, July, August, September, October, November, |
| 1947: | January, February, July, September, |
| 1949: | February, March, December, |
| 1950: | May, June, |
| 1951: | March, June, September, October, |
