TY  - JOUR
T1  - On the Organization of the Fossil Plants of the Coal-Measures.--Part VI. Ferns. 
JF  - Proceedings of the Royal Society of London (1854-1905)
VL  - 22
SP  - 248
EP  - 251
PY  - 1873/01/01/
UR  - http://dx.doi.org/10.1098/rspl.1873.0039
M3  - doi:10.1098/rspl.1873.0039
AU  - Williamson, W.
ER  -