Addressees: Doubleday, Frank N
- SLC to Frank N. Doubleday, 2 November 1902 · Riverdale, N.Y · UCCL12869
- SLC per Isabel V. Lyon to Frank N. Doubleday, 26 April 1903 · Riverdale, N.Y · UCCL06631
- SLC to Frank N. Doubleday, 12–13 October 1903 · New York, N.Y · UCCL06739
- SLC to Frank N. Doubleday, 10 November 1904 · New York, N.Y · UCCL06942
- SLC per Isabel V. Lyon to Frank N. Doubleday, 23 May 1906 · Dublin, N.H · UCCL07445
- SLC per Isabel V. Lyon to Frank N. Doubleday, 25 May 1906 · Dublin, N.H · UCCL02209
- SLC per Isabel V. Lyon to Frank N. Doubleday, 27 July 1906 · Dublin, N.H · UCCL12146
- SLC to Frank N. Doubleday, 9 August 1906 · Dublin, N.H · UCCL12908
- SLC per Isabel V. Lyon to Frank N. Doubleday, 15 August 1906 · Dublin, N.H · UCCL07500
- SLC to Frank N. Doubleday, 24 August 1906 · Dublin, N.H · UCCL07503
- SLC to Frank N. Doubleday, 1906 · New York, N.Y · UCCL12907
- SLC to Frank N. Doubleday, 19 April 1908 · New York, N.Y · UCCL12911
- SLC to Frank N. Doubleday, 6 March 1910 · Hamilton, Bermuda · UCCL12914
1