Sunshine tunnel looking southwest, shows typical "rock piles" of High Grade Hill. Modoc County, California. 1912.
Dates
Date Taken
1912
Summary
Sunshine tunnel looking southwest, shows typical "rock piles" of High Grade Hill. Modoc County, California. 1912. Plate 6-A in U.S. Geological Survey. Bulletin 594. 1915.
Summary
Sunshine tunnel looking southwest, shows typical "rock piles" of High Grade Hill. Modoc County, California. 1912. Plate 6-A in U.S. Geological Survey. Bulletin 594. 1915.
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