| Title | Date | Type | Setname | ||
|---|---|---|---|---|---|
| 26 |  | Arch Mineral Coal Operation P.3 | Image | dha_cp | |
| 27 |  | Arch Mineral Coal Operation P.4 | Image | dha_cp | |
| 28 |  | Arch Mineral Coal Operation P.5 | Image | dha_cp | |
| 29 |  | Arnold, Otto children | Image | dc_bpc | |
| 30 |  | Arthur MacArthur, Jr. | Image | dha_cp | |
| 31 |  | Asahel Collins Beckwith | 1960; 1961; 1962; 1963; 1964; 1965; 1966; 1967; 1968; 1969 | Image | uum_map |
| 32 |  | At Brink of Lower Falls, Yellowstone River | 1911-08 | Image | dha_scp |
| 33 |  | At Stile, Geyser Camp, Bath House and Crowd | 1911-08 | Image | dha_scp |
| 34 |  | B.f. 6-11-55 | 1955-06-11 | Image | uum_map_rr |
| 35 |  | Badlands along upper Green River | 1909-09; 1909-10 | Image | uum_map |
| 36 |  | Bar-C Ranch P.1 | Image | dha_cp | |
| 37 |  | Bar-C Ranch P.2 | 1934 | Image | dha_cp |
| 38 |  | Barn, Swan Lake | 1911-08 | Image | dha_scp |
| 39 |  | Barn, Swan Lake | 1911-08 | Image | dha_scp |
| 40 |  | Barns at Riverside | 1911-08 | Image | dha_scp |
| 41 |  | Bath House, Geyser Camp | 1911-08 | Image | dha_scp |
| 42 |  | Bear preparing to cross road | 1950; 1951; 1952; 1953; 1954; 1955; 1956; 1957; 1958; 1959; 1960; 1961; 1962; 1963; 1964; 1965; 1966; 1967; 1968; 1969; 1970 | Image | uum_map |
| 43 |  | Bear River City, Wyoming P.1 | Image | dha_cp | |
| 44 |  | Beckwith & Co. Bank | Image | dc_bpc | |
| 45 |  | Beckwith home | Image | dc_bpc | |
| 46 |  | Beckwith, A. C. stock farm | Image | dc_bpc | |
| 47 |  | Beckwith, A.C. store | Image | dc_bpc | |
| 48 |  | Beckwith, Frank A. | 1892 | Image | dc_bpc |
| 49 |  | Beckwith, Frank Asahel | 1883-05-01 | Image | dc_bpc |
| 50 |  | Beckwith, Frank Asahel | 1896 | Image | dc_bpc |