TY  - RPRT
TI  - Biostratigraphic classification of the marine Triassic in North America
AU  - N. J. Silberling
AU  - E. T. Tozer
PY  - 1968
DO  - 10.1130/spe110-p1
UR  - https://pubs.usgs.gov/publication/70209121
ID  - 70209121
ER  -