Relevant peer reviewed journal references include:

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American Geophysical Union, 1992, Volcanism and Climate Change, AGU Special Report: Washington DC, American Geophysical Union.

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Bluth, G.J.S., Casadevall, T.J., Schnetzler, C.C., Doiron, S.D., Walter, L.S., Krueger, A.J., and Badruddin, M., 1994, Evaluation of sulfur dioxide emissions from explosive volcanism: the 1982-1983 eruptions of Galunggung, Java, Indonesia: Jour. Volcanol. Geotherm. Res., v. 63, p. 243-256.

Bluth, G.J.S., Scott, C.J., Sprod, I.E., Schnetzler, C.C., Krueger, A.J., and Walter, L.S., 1995, Explosive SO2 emissions from the 1992 eruptions of Mount Spurr, Alaska. U.S. Geol. Surv. Bulletin 2139: 37-45.

Bluth, G.J.S., Doiron, S.D., Schnetzler, C.C., Krueger, A.J., and Walter, L.S., 1992, Global tracking of the SO2 clouds from the June, 1991 Mount Pinatubo eruptions, Geophys. Res. Lett., v. 19, p. 151-154.

Cadle, R.D., 1980, A comparison of volcanic with other fluxes of atmospheric trace gas constituents: Reviews of Geophysics and Space Physics, v. 18, p. 746-752.

Carroll, M.R., and Holloway, J.R., editors, 1994, Volatiles in magmas: Mineralogical Society of America, Reviews in Mineralogy, v. 30, 517 p.

Casadevall, T.J., and Greenland, L.P., 1981, The chemistry of gases emanating from Mount St. Helens, May to September, 1980, in Lipman, P.W. and Mullineaux, D.L., eds., The 1980 eruptions of Mount St. Helens, Washington: U.S. Geological Survey Professional Paper 1250, p. 221-231.

Casadevall, T.J., Johnston, D.A., Harris, D.M., Rose, W.I., Malinconcio, L.L., Stoiber, R.E., Bornhorst, T.J., Williams, S.N., Woodruff, Laurel and Thompson, J.M., 1981, SO2 emission rates at Mount St. Helens from March 29 through December, 1980, in Lipman, P.W. and Mullineaux, D.L., eds., The 1980 eruptions of Mount St. Helens, Washington: U.S. Geological Survey Professional Paper 1250, p. 193-200.

Casadevall, T.J., Rose, W.I., Gerlach, T.M., Greenland, L.P., Ewert, J., Wunderman, R. and Symonds, R., 1983, Gas emissions and the eruptions of Mount St. Helens through 1982: Science, v. 221, p. 1383-1385.

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Other excellent sources of information include: