Addressees: Day, Katherine S
- Clara L. Clemens to Katherine S. Day, 29 July 1894 · Fluelen, Switzerland · UCCL04765
- Clara L. Clemens to Katherine S. Day and Alice H. Day, 18 August 1896 · London, England · UCCL10623
- Clara L. Clemens to Katherine S. Day, 21 December 1900 · New York, N.Y · UCCL10624
- Clara L. Clemens to Katherine S. Day, 25 February 1901 · New York, N.Y · UCCL10625
- Clara L. Clemens to Katherine S. Day, November 1901 · Riverdale, N.Y · UCCL10626
- Clara L. Clemens to Katherine S. Day, 6 November 1901 · Riverdale, N.Y · UCCL10627
- Clara L. Clemens to Katherine S. Day, 11 September 1902 · York Harbor, Me · UCCL10628
- Clara L. Clemens to Katherine S. Day, 2 February 1903 · Riverdale, N.Y · UCCL10629
- Clara L. Clemens to Katherine S. Day, 18 June 1903 · Riverdale, N.Y · UCCL10630
- Susy (Olivia Susan) and Clara L. Clemens to Katherine S. Day and Alice H. Day, Unknown date, Hartford, Conn · UCCL10622
- OLC to Katherine S. Day and Alice H. Day, Unknown date, Hartford, Conn · UCCL11119
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