Fischer, Tobias P. Supplemental material: The Relationship Between Fumarole Gas Composition and Eruptive Activity at Galeras Volcano, Colombia GSA Data Repository Item 9626, Geology, Vol. 24, p. 531. File size: 1 p., about 31 K bytes. Geoscience 1996-01-01
    https://gsapubs.figshare.com/articles/journal_contribution/Supplemental_material_The_Relationship_Between_Fumarole_Gas_Composition_and_Eruptive_Activity_at_Galeras_Volcano_Colombia/12335768
10.1130/9626