Senders: Gray, David, Sr.
- David Gray to SLC, 6 April 1874 · Buffalo, N.Y. · UCLC31984 CU-MARK
- David Gray to SLC, 18 August 1875 · Buffalo, N.Y. · UCLC32201 CU-MARK
- David Gray to SLC, 11 August 1876 · Buffalo, N.Y. · UCLC32402 CU-MARK
- David Gray to SLC, 13 September 1879 · Buffalo, N.Y. · UCLC33064 CU-MARK
- David Gray to SLC, 17 September 1880 · Buffalo, N.Y. · UCLC32847 CU-MARK
- David Gray to SLC, 21 September 1880 · Buffalo, N.Y. · UCLC32851 CU-MARK
- David Gray to SLC, 8 April 1885 · Buffalo, N.Y. · UCLC42472 CU-MARK
- David Gray to SLC, 24 December 1909 · UCLC40393 CU-MARK
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