TY  - RPRT
TI  - Palynology and microstratigraphy of Cretaceous-Tertiary boundary sections in southwestern North Dakota
AU  - Douglas J. Nichols
AU  - K.R. Johnson
PY  - 2002
DO  - 10.1130/0-8137-2361-2.95
UR  - https://pubs.usgs.gov/publication/70221505
ID  - 70221505
ER  -