Senders: Engineer's Club
- Thomas C. Martin for Engineer’s Club to SLC, 8 November 1907 · New York, N.Y. · UCLC37409 CU-MARK
- Thomas C. Martin for Engineer’s Club to Isabel V. Lyon and SLC, 12 November 1907 · New York, N.Y. · UCLC37423 CU-MARK
- Thomas C. Martin for Engineer’s Club to Isabel V. Lyon and SLC, 14 November 1907 · New York, N.Y. · UCLC37426 CU-MARK
- Thomas C. Martin for Engineer’s Club to SLC and Isabel V. Lyon, 6 December 1907 · New York, N.Y. · UCLC37488 CU-MARK
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