Photo 1 of Colorado geological and ore Monarch and Tomichi survey 1913 with many maps and Twin lakes district 1919 with map

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Photo 1 of Colorado geological and ore Monarch and Tomichi survey 1913 with many maps and Twin lakes district 1919 with mapPhoto 2 of Colorado geological and ore Monarch and Tomichi survey 1913 with many maps and Twin lakes district 1919 with mapPhoto 3 of Colorado geological and ore Monarch and Tomichi survey 1913 with many maps and Twin lakes district 1919 with map