Letters received by the United States Geological Survey, 1879-1901.

Eitemau Tebyg

• Registers of letters received by the United States Geological Survey, 1879-1901
  Cyhoeddwyd: (1949)
• Letters sent by the United States Geological Survey, 1879-1895
  Cyhoeddwyd: (1949)
• Report of the Committee on State Affairs, to whom was referred so much of the Governor's message as relates to the Geological Survey : in Senate, February 12, 1857
  Cyhoeddwyd: (1857)
• Annual report of the United States Geological and Geographical Survey of the Territories .
  Cyhoeddwyd: (1874)
• Diary of E.P. Burton, surgeon, 7th reg. Ill., 3rd brig., 2nd div. 16 A.C.
  gan: Burton, Elijah P.
  Cyhoeddwyd: (1939)