Internal structures of Cyclocrinites dactioloides : a receptaculitid alga from the Lower Silurian of Iowa / Matthew H. Nitecki -- and Markes E. Johnson --.

v.39:no.1(1978)

Sedimentary structures from the Carbondale Formation (Middle Pennsylvanian) of Northern Illinois / Charles W. Shabica --.

v.33:no.29(1978)