| Covers listed |
|
| 1928: | 15 December, |
| 1929: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1930: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1931: | January, February, March, April, May, June, July, Vol 20 # 7August, Vol 20 # 8September, Vol 20 # 9October, Vol 20 # 10November, December, |
| 1932: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1933: | Vol 22 # 1January, Vol 22 # 2February, Vol 22 # 3March, Vol 22 # 4April, Vol 22 # 5May, June, July, August, September, October, November, December, |
| 1934: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1935: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1936: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1937: | Vol 26 # 1January, Vol 26 # 2February, Vol 26 # 3March, April, May, Vol 26 # 5June, Vol 26 # 6July, Vol 26 # 7August, Vol 26 # 8September, Vol 26 # 9October, Vol 26 # 10November, Vol 26 # 11December, |
| 1938: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1939: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1940: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1941: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1942: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1943: | January, February, March, |
