Analysis of information sources in references of the Wikipedia article "Herkimer diamond" in English language version.
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: CS1 maint: date and year (link), as quoted in GEOLEX, USGS Archived 2017-08-23 at the Wayback Machine{{cite conference}}
: CS1 maint: date and year (link), as quoted in GEOLEX, USGS Archived 2017-08-23 at the Wayback Machine