The papers are a handwritten diary, correspondence, and part of a translated copy of Celedonio Gutierrez's observations on the activity of Paricutín Volcano, 1943, 1945-1946. Celedonio Gutierrez was an inhabitant of San Juan Parangaricutiro, a community adjacent Paricutín Volcano region, prior to its eruption and served as Foshag's assistant during fieldwork at the volcano. The diary gives a daily

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