Bowden and company Lessee on Keystone lode, Central City district, colorado 1881 Sells Bonanza mine, Tin CUP district, Colorado. &.M.News. Dec. 6, 1882 p.6 c.3 Losses, Updegraff property, Keystone lode, Colo. B.M.News. Oct. 6, 1881 p.2 c.1 Operates Keystone mine, Colo. lassee:, Keystone mine, Central City diet. Colo: 8.M.News. Now.9,1881 p.2 c.1 0
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