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Jan 1, 1949

Jan 1, 1930

Jan 1, 1943

Jan 1, 1905

Data about production in this state are very scarce, and with the exceptions of the years 1850, 1860, 1880 and the later years, the tonnages shown in Table 67 are estimates. [ ]

Jan 1, 1942

By Robert Glass Cleland

[CHAPTER PAGE I Anson Greene Phelps II A Family Enterprise III Railroads, Coal, and Lumber VI William E. Dodge, Merchant and Philanthropist]

Jan 1, 1952

Jan 1, 1897

Some coal was mined in Wyoming for use at the forts as early as 1859, but the commercial development began in 1867, and mining increased with the completion of the Union Pacific Railroad. Tonnages produced are shown in Table 78. [ ]

Jan 1, 1942

Jan 1, 1914

Jan 1, 1884

Jan 1, 1946

Jan 1, 1968

Jan 1, 1943

Jan 1, 1915

Jan 1, 1935

Jan 1, 1885

Jan 1, 1904

Jan 1, 1934

Jan 1, 1879

Jan 1, 1947