Senders: Ellsworth, William W.
- William W. Ellsworth to SLC, October 1881 · UCLC40872 CU-MARK
- William W. Ellsworth for Century Co. to SLC, 4 March 1905 · UCLC34351 CU-MARK
- William W. Ellsworth to SLC, 19 September 1905 · New York, N.Y. · UCLC34642 CU-MARK
- William W. Ellsworth to SLC, 4 September 1907 · New York, N.Y. · UCLC37206 CU-MARK
- William W. Ellsworth to SLC, 12 September 1907 · New York, N.Y. · UCLC37231 CU-MARK
- William W. Ellsworth and Robert Bridges to SLC, 19 August 1908 · New York, N.Y. · UCLC37986 CU-MARK
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