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Survey of helium in natural water wells and springs in southwest Montana and Imperial Valley, California : part VI, Jan. 1 - Dec. 31, 1983
- "Survey of helium in natural water wells and springs in southwest Montana and Imperial Valley, California : part VI, Jan. 1 - Dec. 31, 1983"@en
- "Survey of helium in natural water wells and springs in southwest Montana and Imperial Valley, California part VI, Jan. 1-Dec. 31, 1983"@en