| Title | Date | Type | Setname | ||
|---|---|---|---|---|---|
| 51 |
 | Alley Gadd | 1942 | Image/StillImage | ucl_rhc |
| 52 |
 | Along Navajo Trails: Recollections of a Trader 1898-1948 | 1877 | Text | uaida_main |
| 53 |
 | Anasazi cliff dwelling, Mesa Verde National Park | 1930; 1931; 1932; 1933; 1934; 1935; 1936; 1937; 1938; 1939; 1940; 1941; 1942; 1943; 1944; 1945; 1946; 1947; 1948; 1949; 1950 | Image | uum_map_rr |
| 54 |
 | Anasazi ruins [1] | 1930; 1931; 1932; 1933; 1934; 1935; 1936; 1937; 1938; 1939; 1940; 1941; 1942; 1943; 1944; 1945; 1946; 1947; 1948; 1949; 1950 | Image | uum_map_rr |
| 55 |
 | Anasazi ruins [2] | 1930; 1931; 1932; 1933; 1934; 1935; 1936; 1937; 1938; 1939; 1940; 1941; 1942; 1943; 1944; 1945; 1946; 1947; 1948; 1949; 1950 | Image | uum_map_rr |
| 56 |
 | Anasazi storage cists [1] | 1930; 1931; 1932; 1933; 1934; 1935; 1936; 1937; 1938; 1939; 1940; 1941; 1942; 1943; 1944; 1945; 1946; 1947; 1948; 1949; 1950 | Image | uum_map_rr |
| 57 |
 | Anasazi storage cists [2] | 1930; 1931; 1932; 1933; 1934; 1935; 1936; 1937; 1938; 1939; 1940; 1941; 1942; 1943; 1944; 1945; 1946; 1947; 1948; 1949; 1950 | Image | uum_map_rr |
| 58 |
 | Anasazi storage cists [3] | 1930; 1931; 1932; 1933; 1934; 1935; 1936; 1937; 1938; 1939; 1940; 1941; 1942; 1943; 1944; 1945; 1946; 1947; 1948; 1949; 1950 | Image | uum_map_rr |
| 59 |
 | Anasazi storage cists [4] | 1930; 1931; 1932; 1933; 1934; 1935; 1936; 1937; 1938; 1939; 1940; 1941; 1942; 1943; 1944; 1945; 1946; 1947; 1948; 1949; 1950 | Image | uum_map_rr |
| 60 |
 | Anasazi storage cists [5] | 1930; 1931; 1932; 1933; 1934; 1935; 1936; 1937; 1938; 1939; 1940; 1941; 1942; 1943; 1944; 1945; 1946; 1947; 1948; 1949; 1950 | Image | uum_map_rr |
| 61 |
 | Animas hydroelectric system, Colorado [01] | 1911-10-15 | Image | uum_map |
| 62 |
 | Animas hydroelectric system, Colorado [02] | 1911-10-15 | Image | uum_map |
| 63 |
 | Animas hydroelectric system, Colorado [03] | 1911-10-15 | Image | uum_map |
| 64 |
 | Animas hydroelectric system, Colorado [05] | 1911-10-15 | Image | uum_map |
| 65 |
 | Animas hydroelectric system, Colorado [06] | 1911-10-15 | Image | uum_map |
| 66 |
 | Animas hydroelectric system, Colorado [07] | 1911-10-15 | Image | uum_map |
| 67 |
 | Animas hydroelectric system, Colorado [08] | 1911-10-15 | Image | uum_map |
| 68 |
 | Animas hydroelectric system, Colorado [09] | 1915-11 | Image | uum_map |
| 69 |
 | Animas hydroelectric system, Colorado [10] | 1911-10-15 | Image | uum_map |
| 70 |
 | Animas hydroelectric system, Colorado [38] | 1906 | Image | uum_map |
| 71 |
 | Animas River, Durango | 1925 | Image | uum_map_rr |
| 72 |
 | Animas River, Durango | 1925 | Image | uum_map_rr |
| 73 |
 | Annual Report of the Commissioner of Indian Affairs - 1870 | 1870 | Image/StillImage | uaida_main |
| 74 |
 | Annual Report of the Commissioner of Indian Affairs - 1880 | 1880 | Text | uaida_main |
| 75 |
 | Annual Report of the Commissioner of Indian Affairs - 1884 | 1884 | Text | uaida_main |