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	1.	The geologic time classification of the United States Geological survey compared with other classifications, accompanied by the original definitions of era, period and epoch terms. A compilation by M. Grace Wimarth. by Wilmarth, M. Grace (Mary Grace), 1866-1949 [comp.] Series: U. S. Geological survey. Bulletin ; 769 Material type: Text; Format: print ; Literary form: Not fiction Publication details: Washington, Govt. print. off., 1925 Availability: No items available. Add to cart (remove)
	2.	Names and definitions of the geologic units of California. by Wilmarth, M. Grace (Mary Grace), 1866-1949 Material type: Text; Format: print ; Literary form: Not fiction Publication details: U.S. Govt. Print. Off., 1931 Availability: No items available. Add to cart (remove)

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