Senders: Plasmon Syndicate
- Channing H. Cook for American Plasmon Syndicate to SLC, 26 October 1900 · New York, N.Y. · UCLC32981 CU-MARK
- Plasmon Syndicate to SLC, 19–20 November 1901, Unknown place · UCLC33319 CU-MARK
- Howard E. Wright for American Plasmon Syndicate to SLC, 11 April 1902 · New York, N.Y. · UCLC33438 CU-MARK
- Howard E. Wright for Plasmon Syndicate to SLC, 13 June 1902 · New York, N.Y. · UCLC33490 CU-MARK
- Howard E. Wright for Plasmon Syndicate to SLC, 17 November 1902 · New York, N.Y. · UCLC33573 CU-MARK
- Howard E. Wright for Plasmon Syndicate to SLC, 28 November 1902 · New York, N.Y. · UCLC33594 CU-MARK
- Howard E. Wright for Plasmon Syndicate to SLC, 5 December 1902 · New York, N.Y. · UCLC33612 CU-MARK
- Samuel M. Bergheim for Plasmon Syndicate to SLC, 26 January 1903 · London, England · UCLC33684 CU-MARK
- Howard E. Wright for Plasmon Company of America to SLC, 4 February 1903 · New York, N.Y. · UCLC33698 CU-MARK
- C. Brereton Sharpe for Plasmon Syndicate to SLC, 20 March 1903 · UCLC48775 CU-MARK
- John Y. MacAlister for Plasmon Syndicate to SLC, 27 March 1903 · London, England · UCLC33741 CU-MARK
- Samuel M. Bergheim for Plasmon Syndicate to SLC, 29 July 1903 · London, England · UCLC33806 CU-MARK
- Harold Wheeler for Plasmon Syndicate to SLC, 25 September 1903 · New York, N.Y. · UCLC33826 CU-MARK
- C. Brereton Sharpe for Plasmon Syndicate to SLC, 25 March 1904 · London, England · UCLC33984 CU-MARK
- James D. Campbell for Plasmon Syndicate to SLC, 26 March 1904 · New York, N.Y. · UCLC33985 CU-MARK
- James D. Campbell for Plasmon Syndicate to SLC, 28 March 1904 · New York, N.Y. · UCLC33989 CU-MARK
- Ralph W. Ashcroft for Plasmon Syndicate to SLC, 6 August 1904 · New York, N.Y. · UCLC34162 CU-MARK
- Harold Wheeler for Plasmon Syndicate to Samuel M. Bergheim, 26 August 1904 · New York, N.Y. · UCLC34180 CU-MARK
- Harold Wheeler for Plasmon Syndicate to SLC, 17 September 1904 · New York, N.Y. · UCLC34187 CU-MARK
- C. Brereton Sharpe for Plasmon Syndicate to SLC, 27 October 1904 · London, England · UCLC34208 CU-MARK
- James D. Campbell for Plasmon Syndicate to SLC, 15 November 1904 · New York, N.Y. · UCLC34225 CU-MARK
- C. Brereton Sharpe for Plasmon Syndicate to SLC, 30 November 1904 · London, England · UCLC34233 CU-MARK
- James D. Campbell for Plasmon Syndicate to SLC, 30 December 1904 · New York, N.Y. · UCLC34274 CU-MARK
- Charles MacIlevy for Plasmon Company of America to SLC, 25 March 1905 · New York, N.Y. · UCLC34374 CU-MARK
- W. Robson for Plasmon Company of America to SLC, 27 March 1905 · New York, N.Y. · UCLC34378 CU-MARK
- James D. Campbell for Plasmon Company of America to SLC, 28 April 1905 · New York, N.Y. · UCLC34431 CU-MARK
- C. Brereton Sharpe for Plasmon Syndicate to SLC, 22 May 1905 · London, England · UCLC34455 CU-MARK
- C. Brereton Sharpe for Plasmon Syndicate to SLC, 24 November 1905 · London, England · UCLC34827 CU-MARK
- C. Brereton Sharpe for Plasmon Syndicate to SLC, 3 March 1906 · London, England · UCLC48822 CU-MARK
- C. Brereton Sharpe for Plasmon Syndicate to SLC, 3 March 1906 · London, England · UCLC35287 CU-MARK
- William Woodward Baldwin for Plasmon Syndicate to SLC, 19 May 1906 · New York, N.Y. · UCLC35442 CU-MARK
- Robert D. Hanna for Plasmon Syndicate to SLC, 21 May 1906 · New York, N.Y. · UCLC35444 CU-MARK
- William Woodward Baldwin for Plasmon Syndicate to SLC, 22 May 1906 · New York, N.Y. · UCLC35446 CU-MARK
- John R. Chamberlin for Plasmon Co. of America to SLC, 11 December 1907 · UCLC37497 CU-MARK
- John R. Chamberlin for Plasmon Co. of America to SLC, 14 December 1907 · New York, N.Y. · UCLC37504 CU-MARK
- C. Brereton Sharpe and Ralph W. Ashcroft for Plasmon Syndicate to SLC, 19 March 1908 · London, England · UCLC37725 CU-MARK
- J. W. Walter for Plasmon Syndicate to SLC, 9 September 1909 · London, England · UCLC40298 CU-MARK
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