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Jan 1, 1938

Jan 1, 1945

Jan 1, 1916

Jan 1, 1936

Jan 1, 1939

Jan 1, 1956

Jan 1, 1947

Jan 1, 1935

Jan 1, 1936

Jan 1, 1920

Jan 1, 1909

By F. M. Leonard

Churn-drill hole sludge samples have proved their reliability at Cananea

Jan 5, 1951

Jan 1, 1943

Jan 1, 1897

Jan 1, 1946

Jan 1, 1943

Jan 1, 1934

Jan 1, 1937

Jan 1, 1932

In the period considered all coal produced was used locally, and the totals in Table 43 are estimated from the few data available. [ ]

Jan 1, 1942