TY  - RPRT
TI  - X-ray mineralogy of cores from two Guatemalan caldera lakes
AU  - Lawrence J. Poppe
AU  - Charles K. Paull
AU  - Christopher G. Newhall
PY  - 1981
DO  - 10.3133/ofr811333
UR  - https://pubs.usgs.gov/publication/ofr811333
ID  - ofr811333
ER  -