[029-052] Preservation of Plant Material in Coal Balls from Nashville, IL
Preservation of Plant Material in Coal Balls from Nashville, IL Author: Schopf, James M.
[030-042] Two New Lycopod Seeds From the Illinois Pennsylvanian*
Two New Lycopod Seeds From the Illinois Pennsylvanian* Author: Schopf, James M.
[031-051] Coal Balls as an Index to the Constitution of Coal
Coal Balls as an Index to the Constitution of Coal Author, Schopf, James M.
[031-021] A New Cycadophyte and its Relatives
A New Cycadophyte and its Relatives Author: Schopf, James M.