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Siegfreid mining properties, Boulder County, Colorado

Ayler, Maynard F.
Siegfreid, Jessie Z.
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Abstract
Report consists of two letters; one is dated "March 5, 1957" and the other, "March 20, 1957."
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In copyright - non-commercial use permitted (http://rightsstatements.org/vocab/InC-NC/1.0/).
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