Addressees: Mackey, Robert K
- SLC to Robert K. Mackey, 21 June 1904 · Florence, Italy · UCCL06778
- SLC per Isabel V. Lyon to Robert K. Mackey, 22 December 1905 · New York, N.Y · UCCL10841
- SLC per Isabel V. Lyon to Robert K. Mackey, 23 December 1905 · New York, N.Y · UCCL10839
- Isabel V. Lyon for SLC to Robert K. Mackey, 7 March 1906 · New York, N.Y · UCCL10840
1