Mr. Richard Pearce and smelting force, Empire Forks Silver bricks. Mr. Pearce on extreme left - at one time was connected with the Argon Smelting Works in Argo, and also with the Hill Smelting Works in Central City. (1875). Denver Public Library Digital Collections, accessed 17/05/2025, https://digital.denverlibrary.org/nodes/view/1052298