| Title | Date | Type | Setname | ||
|---|---|---|---|---|---|
| 51 |
 |
Tractor Work | 1930; 1931; 1932; 1933; 1934; 1935; 1936; 1937; 1938; 1939; 1940 | Image/StillImage | dha_rkc |
| 52 |
 |
Zion National Park Camp, rock screening and crushing plant | 1933; 1934; 1935; 1936; 1937; 1938; 1939; 1940; 1941; 1942 | Image | dha_ccc |