Foxworthy, B. L., & Hill, M. (1982). Volcanic eruptions of 1980 at Mount St. Helens: The first 100 days. United States Department of the Interior, Geological Survey.
Chicago Style (17th ed.) CitationFoxworthy, B. L., and Mary Hill. Volcanic Eruptions of 1980 at Mount St. Helens: The First 100 Days. Washington: United States Department of the Interior, Geological Survey, 1982.
MLA (9th ed.) CitationFoxworthy, B. L., and Mary Hill. Volcanic Eruptions of 1980 at Mount St. Helens: The First 100 Days. United States Department of the Interior, Geological Survey, 1982.
Warning: These citations may not always be 100% accurate.