Hayden, F. V., [9], [10], [11], [55], [59], [60], [117], [127], [128], [140], [160].

Hayden, Mt., Ascent of, [14].

Haynes, F. J., [56], [66], [162].

Heap, D. P., [94].

Hedges, C., [137].

Henderson, G. L., [56], [161].

Heizman, C. L., [90], [108].

57. History of the Expeditions under the Command of Lewis and Clark, to the Sources of the Missouri River, thence across the Rocky Mountains and down the Columbia River to the Pacific Ocean. Performed during the Years 1804-5-6, by Order of the Government of the United States. Elliott Coues. 4 vols. New York: Francis P. Harper. 1893. Pages 283, 1153, 1154, 1181, and 1182 contain references to the Y. N. P.

Holmes, W. H., [11], [39], [51], [82].

58. Horseback Rides through the Y. N. P. H. J. Norton. Virginia City, Mont. 1874. The first real guide book of the Park.