Frederiksen, N. O.; Carr, D. R.; Lowe, G. D.; Wosika, E. P. (1983). Middle Eocene palynomorphs from San Diego, California. Part I: Introduction, spores and Gymnosperm pollen. American Association of Stratigraphic Palynologists, Contributions Series no. 12, pp. 8-31.
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Frederiksen, N. O.; Carr, D. R.; Lowe, G. D.; Wosika, E. P.
1983
Middle Eocene palynomorphs from San Diego, California. Part I: Introduction, spores and Gymnosperm pollen. American Association of Stratigraphic Palynologists, Contributions Series no. 12, pp. 8-31.