Addressees: Underhill, Irving S
- SLC to Irving S. Underhill, 6 April 1893 · New York, N.Y · UCCL04639
- SLC to Irving S. Underhill, 23 May 1900 · London, England · UCCL08199
- SLC to Irving S. Underhill, 1 January 1901 · New York, N.Y · UCCL08214
- SLC to Irving S. Underhill, 31 January 1901 · Unknown place · UCCL04316
- SLC to Irving S. Underhill, 3 January 1902 · Riverdale, N.Y · UCCL08225
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