Petrified Wood from Humboldt County, Nevada, USA

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USA
Nevada Humboldt County ⓘ Unnamed prospect (MRDS10295106)	(2005) Mineral Resources Data System (MRDS), US Geological Survey.
ⓘ Virgin Valley	Castor, Stephen B., Ferdock, Gregory C. (2004) Minerals of Nevada. Special Publication 31. Nevada Bureau of Mines and Geology NBMG files No. 50600003
Virgin Valley Mining District ⓘ Meyer Group Mine	(2005) Mineral Resources Data System (MRDS), US Geological Survey.
Virgin Valley ⓘ Becky-Mucket claims	Castor, Stephen B., Ferdock, Gregory C. (2004) Minerals of Nevada. Special Publication 31. Nevada Bureau of Mines and Geology USGS Bull 1538D
ⓘ Black Hope group	(2005) Mineral Resources Data System (MRDS), US Geological Survey.
ⓘ Bonanza Opal Mine (Virgin Mine; Virgin Opal Mine; Bon 1-5 lodes; Defiance Mine; Mathewson-Dow Opal Mine)	USGS Bull 1538D
ⓘ Jo Lu 55 Opal Mine	Castor, Stephen B., Ferdock, Gregory C. (2004) Minerals of Nevada. Special Publication 31. Nevada Bureau of Mines and Geology
ⓘ Rainbow Ridge Mine (Monarch Opal Mine; Roop Mine)	USGS Bull 1538D
ⓘ Royal Peacock Group Mines	USGS Bull 1538D
ⓘ Swordfish Mine	Castor, Stephen B., Ferdock, Gregory C. (2004) Minerals of Nevada. Special Publication 31. Nevada Bureau of Mines and Geology
WRT Stonetree group ("Dominion Opal Mine") ⓘ Black Beauty Opal Mine (WRT Black Beauty claim; BLM-NMC No. 865656)	Wentzell Revocable Trust
ⓘ Stonetree Opal Mine (WRT Stonetree claim; BLM-NMC No. 865655)	Christopher N. Wentzell
ⓘ WRT Fiddles & Diddles Opal claim	Christopher Wentzell, dug 2013 October known since 1994,C. Wentzell collection