[1]
J. J. Macgee, R. I. Tilling, and W. A. Duffield, “PETROLOGIC CHARACTERISTICS OF THE 1982 AND PRE-1982 ERUPTIVE PRODUCTS OF EL CHICHON VOLCANO, CHIAPAS, MEXICO”, GeofInt, vol. 26, no. 1, pp. 85-108, Jan. 1987.