Addressees: Plasmon Company
- SLC to Plasmon Co., 21 October 1900 · New York, N.Y · UCCL12092
- SLC to Plasmon Co., 29 January 1901 · New York, N.Y · UCCL12227
- SLC to Plasmon Co., 10 April 1902 · Riverdale, N.Y · UCCL06321
- SLC to Plasmon Co., 25 April 1902 · Riverdale, N.Y · UCCL06329
- SLC to Plasmon Co., 7 April 1903 · Riverdale, N.Y · UCCL06619
- SLC to the Plasmon Co., 24 June 1904 · Florence, Italy · UCCL13140
- SLC to Plasmon Co., January 1905 · Unknown place · UCCL06977
- SLC per Isabel V. Lyon to Plasmon Co., 12 December 1907 · New York, N.Y · UCCL07874
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