TY  - RPRT
TI  - Text to accompany slides/photographs of Lower Cretaceous pollen and spores in sediments from the Muirkirk clay pit (Prince Georges County, MD)
AU  - Eleanora I. Robbins
PY  - 1991
DO  - 10.3133/ofr91642
UR  - https://pubs.usgs.gov/publication/ofr91642
ID  - ofr91642
ER  -