Analytical method: UNKNOWN
| Technique | UNKNOWN |
|---|---|
| Material | WHOLE ROCK |
| Mineral | none |
| Institution | Unknown, Unknown, USA |
| Reference | Ferriz, Horacio; Mahood, Gail A (1984) Eruption rates and compositional trends at Los Humeros volcanic center, Puebla, Mexico. JGR. Journal of Geophysical Research. B. 89; 10, Pages 8511-8524. 1984. |