| Title | Date | Type | Setname | ||
|---|---|---|---|---|---|
| 876 |
 | Nolan, Mary | 1890-07-16 | Image | dc_bpc |
| 877 |
 | Norma Burton During Winter in Wyoming | 1947; 1948; 1949; 1950 | Image/StillImage | ucl_rhc |
| 878 |
 | Northern Saw-whet Owl (090625-076) | 2009-06-25 | Sound | uu_wss |
| 879 |
 | Office and People at Canyon Camp | 1909-09 | Image | dha_scp |
| 880 |
 | Office, Swan Lake | 1911-08 | Image | dha_scp |
| 881 |
 | Offices, Canyon Camp, Interior | 1911-08 | Image | dha_scp |
| 882 |
 | Oil field, Byron, Wyoming | 1907; 1908; 1909; 1910; 1911; 1912; 1913; 1914; 1915; 1916; 1917; 1918; 1919; 1920; 1921; 1922; 1923; 1924; 1925; 1926; 1927; 1928; 1929; 1930; 1931; 1932; 1933; 1934; 1935 | Image/StillImage | uum_map |
| 883 |
 | Oil well, Byron, Wyoming [01] | 1907; 1908; 1909; 1910; 1911; 1912; 1913; 1914; 1915; 1916; 1917; 1918; 1919; 1920; 1921; 1922; 1923; 1924; 1925; 1926; 1927; 1928; 1929; 1930; 1931; 1932; 1933; 1934; 1935 | Image/StillImage | uum_map |
| 884 |
 | Oil well, Byron, Wyoming [02] | 1907; 1908; 1909; 1910; 1911; 1912; 1913; 1914; 1915; 1916; 1917; 1918; 1919; 1920; 1921; 1922; 1923; 1924; 1925; 1926; 1927; 1928; 1929; 1930; 1931; 1932; 1933; 1934; 1935 | Image/StillImage | uum_map |
| 885 |
 | Oil well, Byron, Wyoming [03] | 1907; 1908; 1909; 1910; 1911; 1912; 1913; 1914; 1915; 1916; 1917; 1918; 1919; 1920; 1921; 1922; 1923; 1924; 1925; 1926; 1927; 1928; 1929; 1930; 1931; 1932; 1933; 1934; 1935 | Image/StillImage | uum_map |
| 886 |
 | Oil well, Byron, Wyoming [04] | 1907; 1908; 1909; 1910; 1911; 1912; 1913; 1914; 1915; 1916; 1917; 1918; 1919; 1920; 1921; 1922; 1923; 1924; 1925; 1926; 1927; 1928; 1929; 1930; 1931; 1932; 1933; 1934; 1935 | Image/StillImage | uum_map |
| 887 |
 | Oiti - Second Chief (Shoshone) | 1883; 1884; 1885; 1886; 1887 | Image/StillImage | uaida_main |
| 888 |
 | Old Faithful | 1911-08 | Image | dha_scp |
| 889 |
 | Old Faithful | 1911-08 | Image | dha_scp |
| 890 |
 | Old Faithful - Upper Geyser Basin | 1908; 1909 | Image | dha_scp |
| 891 |
 | Old Faithful Geyser | 1910-10-02 | Image | dha_scp |
| 892 |
 | Old Faithful Geyser | 1909-09 | Image | dha_scp |
| 893 |
 | Old Faithful Geyser, National Park, Wyoming | 1920; 1921; 1922; 1923; 1924 | uum_map | |
| 894 |
 | Old Faithful Inn | 1908; 1904; 1905; 1906; 1907; 1909; 1910; 1911; 1912 | Image | dha_scp |
| 895 |
 | Old Faithful Inn - Upper Geyser Basin | 1908-08-16 | Image | dha_scp |
| 896 |
 | On the easy route. 2000 ft. fresh air below | 1936 | uum_map | |
| 897 |
 | On the River, Cid Ricketts Sumner on boat. | 1955 | Image | uum_map_rr |
| 898 |
 | On top, Ranger Petzolt, leader | 1936 | uum_map | |
| 899 |
 | Organochlorine compounds and trace elements in streambed sediment and fish tissue, South Platte River Basin; Colorado, Nebraska, and Wyoming | 1997 | Text | wwdl_er |
| 900 |
 | Osprey (090522-S02) | 2009-05-22 | Sound | uu_wss |