Addressees: Young, John R
- Samuel L. Clemens to John Russell Young, 22 November 1867 · Washington, D.C · UCCL00157
- Samuel L. Clemens to John Russell Young, 24 November 1867 · Washington, D.C · UCCL00159
- Samuel L. Clemens to John Russell Young, 25 November 1867 · Washington, D.C · UCCL00161
- Samuel L. Clemens to John Russell Young, 1 December 1867 · Washington, D.C · UCCL00164
- Samuel L. Clemens to John Russell Young, 4 December 1867 · Washington, D.C · UCCL00168
- Samuel L. Clemens to Charles John Russell Young, 1 February 1868 · Washington, D.C · UCCL00188
- Samuel L. Clemens to John Russell Young, 8–10 March 1869 · Hartford, Conn · UCCL00270
- Samuel L. Clemens to John Russell Young, 17 or 18 June 1873 · Ostend, Belgium · UCCL11802
- SLC to John R. Young, 21 February 1881 · Hartford, Conn · UCCL01913
- SLC to John R. Young, 8 April 1881 · Hartford, Conn · UCCL02412
- SLC to John R. Young, 29 April 1881 · Hartford, Conn · UCCL01941
- SLC to John R. Young, 9 January 1882 · Hartford, Conn · UCCL02146
- SLC to John R. Young, 3 February 1882 · Hartford, Conn · UCCL02156
- SLC to John R. Young, 6 March 1882 · Hartford, Conn · UCCL02170
- SLC to John R. Young, 13 March 1882 · Hartford, Conn · UCCL02171
- SLC to John R. Young, 20 March 1882 · Hartford, Conn · UCCL02175
- SLC to John R. Young, 25 April 1882 · Arkansas City, Ark · UCCL02207
- SLC to John R. Young, 7 December 1885 · Hartford, Conn · UCCL11207
- SLC to John R. Young, 20 January 1887 · Hartford, Conn · UCCL03514
- SLC to John R. Young, 13 July 1890 · New York, N.Y · UCCL04063
- SLC to John R. Young, 14 July 1890 · New York, N.Y · UCCL09116
- SLC to John R. Young, 6 August 1890 · Tannersville, N.Y · UCCL04073
- SLC to John R. Young, 8 October 1890 · New York, N.Y · UCCL04099
- SLC to John R. Young, 7 February 1891 · Hartford, Conn · UCCL11160
- SLC to John R. Young, Unknown date, New York, N.Y · UCCL10974
1