Stratigraphic, paleoclimatic, and paleobiogeographic significance of Tertiary sporomorphs from Massachusetts /

অনুযায়ী Frederiksen, Norman O.
প্রকাশিত 1984.

Sporomorph biostratigraphy, floral changes, and paleoclimatology, Eocene and earliest Oligocene of the eastern Gulf Coast /

অনুযায়ী Frederiksen, Norman O.
প্রকাশিত 1988.