Addressees: Harper & Brothers
- SLC to Harper & Brothers, 21 November 1898 · Vienna, Austria · UCCL05419
- SLC to Harper & Brothers, 12 December 1898 · Vienna, Austria · UCCL05479
- SLC to Harper & Brothers, 1 October 1899 · London, England · UCCL11064
- SLC to Harper & Brothers, 23 January 1900 · London, England · UCCL09394
- SLC to Harper & Brothers, August 1900 · London, England · UCCL10112
- SLC to Harper & Brothers, 19 January 1901 · New York, N.Y · UCCL10115
- SLC to Harper & Brothers, 4 September 1901 · Saranac Lake, N.Y · UCCL11227
- SLC per Isabel V. Lyon to Harper & Brothers, 27 January 1903 · Riverdale, N.Y · UCCL06572
- SLC to Harper & Brothers, 13 March 1903 · Riverdale, N.Y · UCCL06598
- SLC, OLC to Harper & Brothers, 23 October 1903 · New York, N.Y · UCCL06752
- SLC to Harper & Brothers, November 1903 · Unknown place · UCCL12494
- SLC to Harper & Brothers, 1 December 1903 · Florence, Italy · UCCL06763
- SLC to Harper & Brothers, 1904 · Unknown place · UCCL06925
- SLC to Harper & Brothers, 29 January 1905 · New York, N.Y · UCCL06990
- SLC to Harper & Brothers, 7 June 1905 · Dublin, N.H · UCCL07058
- Isabel V. Lyon for SLC to Harper & Brothers, 29 September 1905 · Dublin, N.H · UCCL07152
- SLC to Harper & Brothers, 9 October 1905 · Dublin, N.H · UCCL07169
- SLC to Harper & Brothers, 1905 · Unknown place · UCCL06969
- SLC per Isabel V. Lyon to Harper & Brothers, 24 February 1906 · New York, N.Y · UCCL12139
- SLC per Isabel V. Lyon to Harper & Brothers, 31 March 1906 · New York, N.Y · UCCL07406
- Isabel V. Lyon for SLC to Harper & Brothers, 15 June 1906 · Dublin, N.H · UCCL07456
- SLC per Isabel V. Lyon to Harper & Brothers, 17 August 1906 · Dublin, N.H · UCCL07501
- SLC per Isabel V. Lyon to Harper & Brothers, 28 December 1906 · New York, N.Y · UCCL07602
- SLC to Harper & Brothers, 2 April 1907 · New York, N.Y · UCCL07684
- SLC to Harper & Brothers, 17 April 1907 · New York, N.Y · UCCL02690
- SLC per Isabel V. Lyon to Harper & Brothers, 29 May 1907 · Tuxedo Park, N.Y · UCCL07736
- SLC to Harper & Brothers, Unknown date · Unknown place · UCCL07614
- SLC to Harper & Brothers, 11 September 1909 · Redding, Conn · UCCL12912
- SLC to Harper & Brothers, 3 November 1909 · Redding, Conn · UCCL11108
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