Senders: Laffan, William Mackay
- William Mackay Laffan to SLC, 13 January 1880 · New York, N.Y. · UCLC32709 CU-MARK
- William Mackay Laffan to SLC, 15 January 1880 · New York, N.Y. · UCLC33365 CU-MARK
- William Mackay Laffan to SLC, 7 June 1882 · New York, N.Y. · UCLC41293 CU-MARK
- William Mackay Laffan to SLC, 17 June 1882 · New York, N.Y. · UCLC41452 CU-MARK
- William Mackay Laffan to SLC and Harper Bros., 28 July 1882 · New York, N.Y. · UCLC41151 CU-MARK
- William Mackay Laffan for Harper & Bros. to SLC, 11 August 1882 · UCLC41172 CU-MARK
- William Mackay Laffan to SLC, 16 March 1884 · New York, N.Y. · UCLC41812 CU-MARK
- William Mackay Laffan to SLC · 28 September 1884 · New York, N.Y. · UCLC42299 CU-MARK
- William Mackay Laffan for New York Sun to SLC, 25 January 1886 · New York, N.Y. · UCLC42869 CU-MARK
- William Mackay Laffan to SLC · 6 November 1886 · New York, N.Y. · UCLC43093 CU-MARK
- William Mackay Laffan to SLC, 6 December 1886 · New York, N.Y. · UCLC43123 CU-MARK
- William Mackay Laffan for New York Sun to SLC, 7 January 1887 · UCLC43192 CU-MARK
- William Mackay Laffan to SLC, 3 October 1887 · New York, N.Y. · UCLC43790 CU-MARK
- William Mackay Laffan to SLC, 2 November 1887 · New York, N.Y. · UCLC43817 CU-MARK
- William Mackay Laffan to SLC · 5 November 1887 · New York, N.Y. · UCLC43822 CU-MARK
- William Mackay Laffan to SLC, 21 January 1888 · New York, N.Y. · UCLC43908 CU-MARK
- William M. Laffan to SLC, 2 March 1889 · New York, N.Y. · UCLC50604 CU-MARK
- William Mackay Laffan to SLC, 18 July 1889 · New York, N.Y. · UCLC44596 CU-MARK
- William Mackay Laffan to SLC, 12 June 1890 · New York, N.Y. · UCLC45126 CU-MARK
- William Mackay Laffan to SLC, 9 November 1890 · New York, N.Y. · UCLC45305 CU-MARK
- William Mackay Laffan to SLC, 11 February 1901 · New York, N.Y. · UCLC33165 CU-MARK
- William Mackay Laffan to SLC, 24 February 1907 · UCLC40064 CU-MARK
- William Mackay Laffan to SLC, Unknown date · UCLC46631 CU-MARK
- William Mackay Laffan to SLC, Unknown date · UCLC46632 CU-MARK
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