https://www.huntington.org/collections/lib-mssjaninc-aspace-e04974bb8454d3a31833cdde90b9d154
U. S. DEPT. OF THE INTERIOR. Comm. for the Study of Gold (in U. S.): Reports on Gold Mining in U....
The collection consists of letters, manuscripts (including diaries and mining reports), photographs and maps related to the career of mining engineer Charles...
u s dept of the interior
https://www.huntington.org/collections/lib-mssjaninc-aspace-2cf5ed6bc98498c397c55a83f83df325
U. S. DEPT. OF THE INTERIOR. Bureau of Mines: Correspondence | Collections | The Huntington
The collection consists of letters, manuscripts (including diaries and mining reports), photographs and maps related to the career of mining engineer Charles...
u s dept of the interiorcorrespondence collections