Addressees: Riggs, Kate Douglas
- SLC to Kate D. Riggs, 8 February 1901 · New York, N.Y · UCCL02813
- SLC to Kate D. Riggs, 9 December 1905 · New York, N.Y · UCCL07246
- SLC to Kate D. Riggs, 7 December 1906 · Washington, D.C · UCCL08271
- SLC to Kate D. Riggs, Unknown date · Unknown place · UCCL07291
- Ralph W. Ashcroft for SLC to Kate D. Riggs, 19 June 1907 · London, England · UCCL07755
- SLC to Kate D. Riggs, 22 November 1907 · New York, N.Y · UCCL10430
- SLC to Kate D. Riggs, 14 January 1908 · New York, N.Y · UCCL12406
- SLC to Kate D. Riggs, 17 January 1908 · New York, N.Y · UCCL11615
- SLC to Kate D. Riggs, 11 February 1908 · New York, N.Y · UCCL09382
- SLC to Kate D. Riggs, January n.y. · Unknown place · UCCL12411
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