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The Sixth geological survey.
An administrative report of the several mineral resources and general geological investigations undertaken and completed in Kentucky during the biennial period 1920-1921-

APA Citation

Kentucky Geological Survey., Crouse, C. Stevens., St. Clair, S., Jillson, W. Rouse., Weller, S., Merrill, G. P. (George Perkins). (1921). The Sixth geological survey: An administrative report of the several mineral resources and general geological investigations undertaken and completed in Kentucky during the biennial period 1920-1921-. Frankfort.

MLA Citation

Merrill, G. P. (George Perkins), et al.. The Sixth Geological Survey: An Administrative Report of the Several Mineral Resources And General Geological Investigations Undertaken And Completed In Kentucky During the Biennial Period 1920-1921-. Frankfort, 1921.

Warning: These citations may not always be complete (especially for serials).