| Covers listed |
|
| 1916: | #1 /January, #2 /February, #3 /March, #4 /April, #5 /May, #6 /June, #7 /July, #8 /August, #9 /September, #10 /October, #12 /December, |
| 1917: | January, February, March, April, May, June, July, August, October, November, December, |
| 1918: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1919: | May, |
| 1920: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1921: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1922: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1923: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1924: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1925: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1926: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1927: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1928: | January, February, March, April, May, June, July, August, September, October, November, 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, August, September, October, November, December, |
| 1932: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1933: | January, February, March, April, May, 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: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 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, April, May, June, July, August, September, October, November, December, |
| 1944: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1945: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1946: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1947: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1948: | January, February, May/June, July/August, September/October, November/December, |
