Source: Townsend family, 2007]]> No Copyright – United States]]>
Source: Sam Carlson. Digital donation, 2020]]> In Copyright - Non-Commercial Use Permitted]]>
Source: South Park Historical Foundation]]> In Copyright - Rights-Holder(s) Unlocatable or Unidentifiable]]>
Source: South Park Historical Foundation, 2004]]> No Copyright – United States]]>
Source: National Mining Hall of Fame and Museum, 2007]]> Copyright Undetermined]]>
Source: Rocky Mountain View Co.]]> No Copyright – United States]]>
Source: South Park Historical Foundation]]> Copyright Undetermined]]>
Source: Howard and Freda Mason]]> Copyright Not Evaluated]]>
Source: South Park Historical Foundation, 2004]]> Copyright Undetermined]]>
Source: South Park Historical Foundation, 2004]]> Copyright Not Evaluated]]>