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First-hand report on Ferdinand V. Hayden's 1873 exploration of Colorado by a Tribune correspondent, which is one of the earliest reports on the discovery of the Mount of the Holy Cross. Contains Hayden’s letter to the editor asking for public support for his exploration. Also includes a series of six lectures by Louis A. Agassiz about his Amazon explorations; and Capt. Jones’s 1873 Expedition to Yellowstone.