Title | Date | Type | ||
---|---|---|---|---|
1 | Gilsonite Mines and Mining - "Mack, Colo. - Rod Francke, Tom Davis, C.J. Neal - Gilsonite Storage Area" | 1920; 1921; 1922; 1923; 1924; 1925; 1926; 1927; 1928; 1929; 1930; 1931; 1932; 1933; 1934; 1935; 1936; 1937; 1938; 1939; 1940 | Image | |
2 | "A 7 1/2% Grade on the Utah Railway - Uintah Railway" | 1920; 1921; 1922; 1923; 1924; 1925; 1926; 1927; 1928; 1929; 1930; 1931; 1932; 1933; 1934; 1935; 1936; 1937; 1938; 1939 | Image |