| Title | Date | Type | Setname | ||
|---|---|---|---|---|---|
| 1251 |
 | Mormon Trail map | 1947 | Image/StillImage | uum_tawp |
| 1252 |
 | Morris Dam: Outlook works | 1938 | uum_map | |
| 1253 |
 | Morris Dam: Spillway design | 1938 | uum_map | |
| 1254 |
 | Morro Rock | 1938 | uum_map | |
| 1255 |
 | Mother bear and her cubs, Yosemite National Park | 1910; 1911; 1912; 1913; 1914; 1915; 1916; 1917; 1918; 1919; 1920; 1921; 1922; 1923; 1924; 1925; 1926; 1927; 1928; 1929; 1930 | Image | uum_map |
| 1256 |
 | Mount Lassen in eruption | 1914 | Image/StillImage | uum_map_rr |
| 1257 |
 | Mount Wilson, California, as by Phil Smith | 1937; 1938; 1939 | uum_map | |
| 1258 |
 | Mount Wilson, California: 100" telescope | 1937; 1938; 1939 | uum_map | |
| 1259 |
 | Mount Wilson, California: Phil Smith | 1937; 1938; 1939 | uum_map | |
| 1260 |
 | Mount Wilson, California: solar telescope | 1937; 1938; 1939 | uum_map | |
| 1261 |
 | Mount Wilson, California: WMG & friend | 1937; 1938; 1939 | uum_map | |
| 1262 |
 | Mountain Lion 1 | Sound | uu_wss | |
| 1263 |
| Mountain Lion 2 | Sound | uu_wss | |
| 1264 |
| Mountain Lion 3 | Sound | uu_wss | |
| 1265 |
| Mountain Lion 4 | Sound | uu_wss | |
| 1266 |
 | Mountain Theater, Tamalpais | 1940; 1941; 1942; 1943; 1944; 1945; 1946; 1947; 1948; 1949; 1950; 1951; 1952; 1953; 1954; 1955; 1956; 1957; 1958; 1959; 1960 | Image/StillImage | uum_map |
| 1267 |
 | Mountain Theater, Tamalpais | 1940; 1941; 1942; 1943; 1944; 1945; 1946; 1947; 1948; 1949; 1950; 1951; 1952; 1953; 1954; 1955; 1956; 1957; 1958; 1959; 1960 | Image/StillImage | uum_map |
| 1268 |
 | Mountain Theater, Tamalpais | 1940; 1941; 1942; 1943; 1944; 1945; 1946; 1947; 1948; 1949; 1950; 1951; 1952; 1953; 1954; 1955; 1956; 1957; 1958; 1959; 1960 | Image/StillImage | uum_map |
| 1269 |
 | Mountain Theater, Tamalpais | 1940; 1941; 1942; 1943; 1944; 1945; 1946; 1947; 1948; 1949; 1950; 1951; 1952; 1953; 1954; 1955; 1956; 1957; 1958; 1959; 1960 | Image/StillImage | uum_map |
| 1270 |
 | Mountain Theatre, Mt. Tamalpais | 1947-10-05 | Image/StillImage | uum_map |
| 1271 |
 | Mr. and Mrs. Chris Lianides, William Hearst Castle, 1960. | 1960 | Image | uum_map |
| 1272 |
 | Mt. Tamalpais | 1930; 1931; 1932; 1933; 1934; 1935; 1936; 1937; 1938; 1939; 1940; 1941; 1942; 1943; 1944; 1945; 1946; 1947; 1948; 1949 | Image/StillImage | uum_map_rr |
| 1273 |
 | Mt. Whitney and Death Valley, highest and lowest points in the U.S. as seen from Dantes view, Death Valley National Monument, Death Valley, Calif. | 1930 | Image | uum_map |
| 1274 |
 | Mud cracks in a stream channel on the lower part of the fan of Cave Spring Wash, South Death Valley | 1924 | Image | uum_map |
| 1275 |
 | Mud wrestling | 1937 | uum_map |