TY  - RPRT
TI  - Key to the recognition of normapolles and some morphologically similar pollen genera
AU  - D.J. Batten
AU  - R. A. Christopher
PY  - 1981
DO  - 10.1016/0034-6667(81)90117-2
UR  - https://pubs.usgs.gov/publication/70011822
ID  - 70011822
ER  -