TY  - RPRT
TI  - Morphologic interpretation of fertile structures in glossopterid gymnosperms
AU  - J. M. Schopf
PY  - 1976
DO  - 10.1016/0034-6667(76)90021-x
UR  - https://pubs.usgs.gov/publication/70010046
ID  - 70010046
ER  -