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Jan 1, 1943

Jan 1, 1917

Jan 1, 1905

Jan 1, 1943

Jan 1, 1879

Jan 1, 1968

Jan 1, 1915

Jan 1, 1942

There are references to the early and continuous production of coal since 1851, but few definite figures. Some data were obtained from Bancroft, but nearly all the tonnages in Table 80, prior to 1869, are estimated. [ ]

Jan 1, 1942

Jan 1, 1938

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Jan 1, 1907

New Products Equipment

Jan 7, 1951

Jan 1, 1897

Jan 1, 1936

Jan 1, 1916

Jan 1, 1934

Jan 1, 1922

Jan 1, 1930