Sherman, W. T., [64].
Shields, G. O., [18].
101. Siliceous Pebbles from the Geyser of the Yellowstone Cañon. A. P. Townsend. American Chemist, vol. iii, p. 288.
Siliceous Sinter, Formation of, [12].
102. Soaping Geysers. Arnold Hague. Science, vol. xiii, p. 382. Also in Smithsonian Report for 1892, p. 153.
103. Soaping Geysers. Popular Science Monthly, vol. xxxvii, p. 139.
104. Soaping Geysers. R. W. Raymond. Transactions of the American Institute of Mining Engineers, Buffalo Meeting, October, 1888.
Stanley, E. J., [88].
105. Statistics of Mines and Mining. Rossiter W. Raymond. Washington: Government Printing Office. 1870. Page 312 contains references to the geysers of the Yellowstone.
106. Statistics of Mines and Mining. Rossiter W. Raymond. Washington: Government Printing Office. 1872. Pages 213-216 contain a reference to the geysers from the pen of General Washburn.