APA (7th ed.) Citation

United States. Forest Service. Pacific Northwest Region. (1986). Mount St. Helens National Volcanic Monument. Pacific Northwest Region.

Chicago Style (17th ed.) Citation

United States. Forest Service. Pacific Northwest Region. Mount St. Helens National Volcanic Monument. [Portland, Or.?]: Pacific Northwest Region, 1986.

MLA (9th ed.) Citation

United States. Forest Service. Pacific Northwest Region. Mount St. Helens National Volcanic Monument. Pacific Northwest Region, 1986.

Warning: These citations may not always be 100% accurate.