TY  - RPRT
TI  - Functional groups in a single pteridosperm species: Variability and circumscription (Pennsylvanian, Nova Scotia, Canada)
AU  - E.L. Zodrow
AU  - Maria Mastalerz
PY  - 2007
DO  - 10.1016/j.coal.2006.06.010
UR  - https://pubs.usgs.gov/publication/70029860
ID  - 70029860
ER  -