Senders: Alden, W. L.
- William L. Alden and Harper Bros. to SLC, 3 November 1881 · New York, N.Y. · UCLC40909 CU-MARK
- William L. Alden to SLC, 28 February 1885 · New York, N.Y. · UCLC42422 CU-MARK
- William L. Alden to SLC, 15 March 1885 · New York, N.Y. · UCLC40724 CU-MARK
- William L. Alden to SLC, 12 May 1887 · Rome, Italy · UCLC43294 NPV
- William L. Alden to SLC, 2 September 1907 · Augusta, Ga. · UCLC37195 CU-MARK
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