The Power Trail: History of Hydroelectricity at Niagara by Brett Gawronski, Jana Kasikova, Lynda Schneekloth, Thomas Yots
Dr. Nikola Tesla: English / Serbo-Croatian Diary Comparisons and Tesla / Scherff Colorado Springs Correspondence by John T. Ratzlaff and Fred A. Jost
Nikola Tesla - From Colorado to Long Island: Research Notes - Colorado Springs 1899-1900 - New York 1900-1901 by Nikola Tesla
