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1964
Evernden, J. F., and G. T. James. "Potassium-Argon Dates and the Tertiary Floras of North America." American Journal of Science 262 (1964): 945-974.
1961
Thomas, John Hunter. "Introduction: Description of the Santa Cruz Mountains." In Flora of the Santa Cruz Mountains of California, 3-9. Stanford, California: Stanford University Press, 1961.
Thomas, John Hunter. "Introduction: Description of the Santa Cruz Mountains." In Flora of the Santa Cruz Mountains of California, 3-9. Stanford, California: Stanford University Press, 1961.