TY  - RPRT
TI  - Upper Paleozoic floral zones and floral provinces of the United States, with a glossary of stratigraphic terms
AU  - Charles Brian Read
AU  - Sergius H. Mamay
AU  - Grace C. Keroher
PY  - 1964
DO  - 10.3133/pp454k
UR  - https://pubs.usgs.gov/publication/pp454K
ID  - pp454K
ER  -