Annual Report to Shareholders
Calumet & Hecla Mining
| Columbia | 1895/96-1922 |
| Harvard | 1884-1921. |
| MIT | 1909, 1910, 1911, 1912, 1913, 1914, 1915, 1916, 1917, 1918, 1919, 1920, 1921, 1922 |
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