Gaya APA

Monitoring Volcanoes: Techniques and Strategies Used by the Staff of the Cascades Volcano Observatory, 1980-90. (). Washington: U.S Geological Survey Bulletin..

Gaya MLA

Monitoring Volcanoes: Techniques and Strategies Used by the Staff of the Cascades Volcano Observatory, 1980-90. . Washington: U.S Geological Survey Bulletin., . .