United States. Census Office, Emmons, S. F., & Becker, G. F. (1885). Statistics and technology of the precious metals. GPO.
Lua i Stíl Chicago (17ú heag.)United States. Census Office, Samuel Franklin Emmons, agus George F. Becker. Statistics and Technology of the Precious Metals. Washington: GPO, 1885.
Lua MLA (8ú heag.)United States. Census Office, et al. Statistics and Technology of the Precious Metals. GPO, 1885.
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