| details |
Middle Pennsylvanian |
|
Illinois |
Darrah,E.L. The microstructure of some Pennsylvanian seeds and megaspores studied by maceration. |
1968 |
| details |
Middle Pennsylvanian |
|
Iowa |
Darrah,E.L. The microstructure of some Pennsylvanian seeds and megaspores studied by maceration. |
1968 |
| details |
Middle Pennsylvanian |
|
Kansas |
Darrah,E.L. The microstructure of some Pennsylvanian seeds and megaspores studied by maceration. |
1968 |
| details |
Middle Pennsylvanian |
|
USA |
Zimmerman,R.P. The ultrastructure of Paleozoic megaspores membranes. |
1970 |
| details |
Middle Pennsylvanian |
|
USA |
Kedves,M. Tranmission Electron Microscopy of the Fossil Gymnosperm Exines. |
1994 |