Hand-drawn, hand-colored and annotated map showing the 280 foot level of the Combination Mine. Printed on map: 'Mohawk, col. el. 5958.48; Hayes & Monnette No. 2, col. el. 5935.7; Hayes & Monnette No. 1, col. el. 5925.8; Truett, col. el. 5938.8; Combination, col. el. 5986.31.'
Hand-drawn, hand-colored and annotated map showing the 600 foot, or third, level of the Clermont Mine. Handwritten at top of map: 'Clermont, 3rd level.'
'Edition of 1921.' 'W. H. Herron, Acting Chief Geographer; Geo. R. Davis, Geographer In Charge; Topography by H. H. Hodgeson, N. E. Ballmer, and W. B. Upton, Jr.; Control by H. H. Hodgeson, Roscoe Reeves, and D. S. Birkett. Surveyed in 1916.' At top of map: ' Topography, State of Nevada.' At upper left corner: ' Department of the Interior, Albert B. Fall, Secretary; U.S. Geological Survey, George Otis Smith, Director.' Southern Nevada Mining Map Collection. 15 minute series (topographic) Nevada.