1. The Lower Eocene floras of Southeastern North America;Berry;U.S.G.S. Prof. Pap.,1916
2. Revision of the Lower Eocene Wilcox flora of the southeastern states;Berry;U.S.G.S. Prof. Pap.,1930
3. Further additions to some fossil floras of the western United States;Brown;Wash. Acad. Sci.,1937
4. Investigations of angiosperms from the Eocene of North America: a mimosoid inflorescence;Crepet;Am. J. Bot.,1977
5. Eocene angiosperm flowers;Crepet;Science,1974