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Humboldt County, California
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- "State & County QuickFacts". United States Census Bureau. http://quickfacts.census.gov/qfd/states/06/06023.html. Retrieved April 11, 2018.
- "Find a County". National Association of Counties. Archived from the original on May 31, 2011. https://web.archive.org/web/20110531210815/http://www.naco.org/Counties/Pages/FindACounty.aspx. Retrieved June 7, 2011.