Hanna, G. D. (1931). Diatoms and silicoflagellates of the Kreyenhagen shale. Mining in California. California Division of Mines Report of the State Mineralogist. 27(2): 187-201.
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Hanna, G. D.
1931
Diatoms and silicoflagellates of the Kreyenhagen shale
Mining in California. California Division of Mines Report of the State Mineralogist