TY  - JOUR
T1  - On the Organization of the Calamites of the Coal-Measures. 
JF  - Proceedings of the Royal Society of London (1854-1905)
VL  - 19
SP  - 268
EP  - 271
PY  - 1870/01/01/
UR  - http://dx.doi.org/10.1098/rspl.1870.0038
M3  - doi:10.1098/rspl.1870.0038
AU  - Williamson, W.
ER  -