TY  - RPRT
TI  - Changes in stratigraphic nomenclature in the Cretaceous system, east-central Puerto Rico
AU  - Reginald Peter Briggs
PY  - 1969
DO  - 10.3133/b1274o
UR  - https://pubs.usgs.gov/publication/b1274O
ID  - b1274O
ER  -