Geologic map of the Ferndale, Fortuna & Iaqua Buttes 15 minute quadrangles [cartographic material] : Humboldt County, California / by Thomas W. Dibblee, Jr. ; edited by John A. Minch.
"Topographic base map from available USGS 15-minute quadrangle ... Ferndale, CA 1959. AMS 1165 III - Series V795; Fortuna, CA 1959, AMS 1165 II - Series V795; Iaqua Buttes, CA 1950. AMS 1265 III - Series V795." "First printing, October 2008." "Scott T. Hector honorary map." Includes location map, index to adjacent 15 minute quadrangles and index to sources of geology, most recent 1987. Relief shown by contours and spot heights.
- Santa Barbara Museum of Natural History
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