1. Boston Sunday Post’s Special Map to Help You Follow MacMillan, Amundsen and Other Polar Explorations. URL: https://www.jamesarsenault.com/pages/books/5358/boston-sunday-post-s-special-map-to-help-you-follow (20.06.2023).

2. R. E. Byrd, “Flying over the Arctic,” The National geographic magazine, vol. 48, no. 5. p. 519-532, November, 1925.

3. H. Cones and J. Bryant, “Dangerous Crossings : The First Modern Polar Expedition, 1925,” International Journal of Naval History, vol. 7, no. 3. December 2008.

4. “MacMillan in the Field,” The National geographic magazine, vol. 48, no. 4. pp. 473-476, October 1925.

5. Eugene (Gene) McDonald, Jr. “LCDR”. URL: http://navy.togetherweserved.com/usn/servlet/ tws.webapp.WebApp?cmd=ShadowBoxProfile&type=EventExt&ID=228749 (18.06.2013).

6. I. G. Drazen, “John Reinartz,” Radiolyubitel’, no. 23-24, p. 458, 1926. (In Russ.).

7. “1QP, K6BJ John L. Reinartz,” Tribute to Ham Radio Operators. URL: http://hamgallery.com/Tribute (18.06.2023).

8. D. B. MacMillan, “The MacMillan Arctic expedition returns,” The National geographic magazine, vol. 48, no. 5, pp. 477-518, November 1925.

9. “Reinartz transmitter and receiver for short waves,” Radio vsem, no. 2. pp. 19-20, 1926. (In Russ.).

10. “Reinartz transmitter,” Radio vsem, no. 16, pp. 388-389, 1927.

11. J. L. Reinartz, “Easy Construction for the ‘Ham,’” Radio News, p. 1462, June 1927.

12. “UV204A. N6JV’S TRANSMITTING TUBE MUSEUM.” URL: http://n6jv.com/museum/articles/articles/uv204.pdf (18.06.2023).

13. V. M. Pestrikov, Evolution of tube devices for wireless transmission of information. SPb : SPbGUSE Publishing House, 2012.