Senders: Collier, Robert J.
- Robert J. Collier to SLC, 4 May 1903 · New York, N.Y. · UCLC33772 CU-MARK
- Robert J. Collier to SLC, 28 May 1903 · New York, N.Y. · UCLC33790 MoHM
- Robert J. Collier to SLC, 10–12? October 1905, New York, N.Y. · UCLC40029 CU-MARK
- Robert J. Collier to SLC, 14 March 1907, New York, N.Y. · UCLC46508 CU-MARK
- Robert J. Collier to SLC, 1 November 1907 · New York, N.Y. · UCLC37392 CU-MARK
- Robert J. Collier to SLC and Isabel V. Lyon, 4 January 1908 · New York, N.Y. · UCLC37551 CU-MARK
- Robert J. Collier to SLC, 14 February 1908 · New York, N.Y. · UCLC37660 CU-MARK
- Robert J. Collier to SLC, 20 or 21 February 1908, New York, N.Y. · UCLC46507 CU-MARK
- Robert J. Collier to SLC, 22 September 1908 · New York, N.Y. · UCLC38054 CU-MARK
- Theodore Roosevelt and Robert J. Collier to SLC, 13 March 1909 · New York, N.Y. · UCLC40154 CU-MARK
- Robert J. Collier to SLC, before 24 April 1909 · New York, N.Y. · UCLC40311 CU-MARK
- Charles E. Miner for Robert J. Collier to SLC, 21 June 1909 · New York, N.Y. · UCLC40273 CU-MARK
- Mr. and Mrs. Robert J. Collier to SLC, 28 December 1909 · New York, N.Y. · UCLC40619 CU-MARK
- Robert J. Collier to SLC, 11 April 1910 · New York, N.Y. · UCLC46398 CU-MARK
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