Empire Copper Company Federal Returns; Capital Stock Tax. 1916, 1917, 1918; Corporation Undistributed Net Income. 1917; Corporation Excess Profits. 1917; Annual Net Income, Manufacturing Corporations. 1912; Empire Copper Company County Property Tax. 1910, 1914-1921; Macbeth Lease County Tax Receipt. 1906; Mackay Development Company County Tax Statement. 1911, 1914; Mackay Metals. Memo of Income. 1929