1954. 2018-06-21T19:45:28Z. 2018-06-21T19:45:28Z. Johnson, Ross B., 1919-. U.S. Geological Survey. English. cartographic image. Public. Colorado, Huerfano County, U.S., and Huerfano County.
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2. Geologic map of the Apache Springs quadrangle, San Miguel County, New Mexico [cartographic material]
1974. 2012-04-23T17:32:28Z. 2012-05-03T15:41:10Z. Johnson, Ross B., 1919-. U.S. Geological Survey. English. Public. New Mexico and San Miguel County.
1975. 2012-05-03T15:57:54Z. 2012-05-09T14:06:26Z. Johnson, Ross B., 1919-. The Survey. English. Public. New Mexico and Mora County.
1969. 2012-10-11T14:27:35Z. 2012-10-11T14:27:35Z. Johnson, Ross B., 1919-. Interior--Geological Survey. English. Public. Colorado.
