| Title | Date | Type | Setname | ||
|---|---|---|---|---|---|
| 201 |
 | Allen Gentry on Horse | 1952 | Image/StillImage | ucl_rhc |
| 202 |
 | Alley Gadd | 1945; 1946; 1947; 1948; 1949; 1950 | Image/StillImage | ucl_rhc |
| 203 |
 | Alley Gadd | 1942; 1943; 1944; 1945 | Image/StillImage | ucl_rhc |
| 204 |
 | Alley Gadd | 1942 | Image/StillImage | ucl_rhc |
| 205 |
 | Along Navajo Trails: Recollections of a Trader 1898-1948 | 1877 | Text | uaida_main |
| 206 |
 | Along the Yampa River, May 1963 | 1963-05 | Image/StillImage | uum_map_rr |
| 207 |
 | Amtrak P.1 | 1975-08-30 | Image/StillImage | dha_cp |
| 208 |
 | Amtrak P.12 | 1989-04-25 | Image/StillImage | dha_cp |
| 209 |
 | Amtrak P.13 | 1989-05-14 | Image/StillImage | dha_cp |
| 210 |
 | Amtrak P.14 | 1989-04-25 | Image/StillImage | dha_cp |
| 211 |
 | Analysis of ground-water-quality data of the Upper Colorado River basin, water years 1972-92 | 1998 | Text | wwdl_er |
| 212 |
 | 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 |
| 213 |
 | 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 |
| 214 |
 | 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 |
| 215 |
 | 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 |
| 216 |
 | 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 |
| 217 |
 | 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 |
| 218 |
 | 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 |
| 219 |
 | 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 |
| 220 |
 | Animas hydroelectric system, Colorado [01] | 1911-10-15 | Image | uum_map |
| 221 |
 | Animas hydroelectric system, Colorado [02] | 1911-10-15 | Image | uum_map |
| 222 |
 | Animas hydroelectric system, Colorado [03] | 1911-10-15 | Image | uum_map |
| 223 |
 | Animas hydroelectric system, Colorado [05] | 1911-10-15 | Image | uum_map |
| 224 |
 | Animas hydroelectric system, Colorado [06] | 1911-10-15 | Image | uum_map |
| 225 |
 | Animas hydroelectric system, Colorado [07] | 1911-10-15 | Image | uum_map |