TY  - RPRT
TI  - Pollen and spores of terrestrial plants
AU  - Christopher E. Bernhardt
AU  - Debra A. Willard
PY  - 2015
DO  - 10.1002/9781118452547.ch14
UR  - https://pubs.usgs.gov/publication/70156817
ID  - 70156817
ER  -