Senders: Riggs, Kate Douglas
- Kate Douglas Riggs to SLC, 30 November 1905 · New York, N.Y. · UCLC34922 CU-MARK
- Kate D. Riggs and George C. Riggs to Clara L. Clemens and SLC, 28–31 October 1906 · UCLC35669 CU-MARK
- Kate Douglas Riggs to SLC, 17 June 1907 · London, England · UCLC36511 CU-MARK
- Kate Douglas Riggs to SLC, 24 November 1907 · New York, N.Y. · UCLC37455 CU-MARK
- Kate Douglas Riggs to SLC, 19 January 1908 · UCLC50379 CU-MARK
- Kate Douglas Riggs to SLC, 11 February 1908 · New York, N.Y. · UCLC37653 CU-MARK
- Kate Douglas Riggs to SLC, Unknown date · UCLC38891 CU-MARK
- Kate Douglas Riggs to SLC, Unknown date · UCLC41879 Smith 1925
- Kate Douglas Riggs to SLC, Unknown date · UCLC46723 CU-MARK
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