TY  - RPRT
TI  - Permian chronostratigraphic subdivisions
AU  - Jin Yugan
AU  - Bruce R. Wardlaw
AU  - Brian F. Glenister
AU  - Galina V. Kotlyar
PY  - 1997
UR  - https://pubs.usgs.gov/publication/70073403
ID  - 70073403
ER  -