39. Fossil Forests of the Volcanic Tertiary Formations of the Y. N. P. W. H. Holmes. Bulletin United States Geological Survey, vol. v, p. 125. Washington: Government Printing Office. 1879.
40. Fossil Forests of the Yellowstone. Walter Harvey Weed. School of Mines Quarterly, vol. xiii, no. 3.
41. Fossil Forests of the Yellowstone. Prof. Samuel E. Tillman. United States Military Academy. Popular Science Monthly, vol. xliii, p. 301, July, 1893.
42. Fossil Forests of the Yellowstone. Prof. Frank H. Knowlton, P. H. D. The Epoch, vol. i, no. 1, p. 18. April, 1895.
Francis, E., [49].
Frankland, E., [143].
Game Exploration, Y. N. P., [158].
Game Preserve, The Y. N. P. as a, [2].
Gannett, H., [10], [11], [153].
Geike, A., [48].