APA (7th ed.) Citation

Geological Survey (U.S.). (1997). Volcanic ash: Danger to aircraft in the North Pacific : reducing the risk from volcano hazards. U.S. G.P.O..

Chicago Style (17th ed.) Citation

Geological Survey (U.S.). Volcanic Ash: Danger to Aircraft in the North Pacific : Reducing the Risk from Volcano Hazards. [Washington, D.C.?]: U.S. G.P.O., 1997.

MLA (9th ed.) Citation

Geological Survey (U.S.). Volcanic Ash: Danger to Aircraft in the North Pacific : Reducing the Risk from Volcano Hazards. U.S. G.P.O., 1997.