Sources: NCH
- Susy (Olivia Susan) Clemens to Louise Brownell, 20 April 1891 · Bryn Mawr, Pa · UCCL09128
- Susy (Olivia Susan) Clemens to Louise Brownell, 29 April 1891 · Hartford, Conn · UCCL09129
- Susy (Olivia Susan) Clemens to Louise Brownell, October 1891 · Unknown place · UCCL09133
- Susy (Olivia Susan) Clemens to Louise Brownell, October 1891 · Berlin, Germany · UCCL09132
- Susy (Olivia Susan) Clemens to Louise Brownell, 2 October 1891 · Ouchy, Switzerland · UCCL09130
- Susy (Olivia Susan) Clemens to Louise Brownell, 3 October 1891 · Lucerne, Switzerland · UCCL09138
- Susy (Olivia Susan) Clemens to Louise Brownell, 6 October–7 October 1891 · Lucerne, Switzerland · UCCL09135
- Susy (Olivia Susan) Clemens to Louise Brownell, 6 October–7 October 1891 · Lucerne, Switzerland · UCCL09134
- Susy (Olivia Susan) Clemens to Louise Brownell, 31 October 1891 · Berlin, Germany · UCCL09136
- Susy (Olivia Susan) Clemens to Louise Brownell, 12 November 1891 · Berlin, Germany · UCCL09137
- Susy (Olivia Susan) Clemens to Louise Brownell, 8 April 1892 · Trent, Austria · UCCL09139
- Susy (Olivia Susan) Clemens to Louise Brownell, 20 April 1892 · Rome, Italy · UCCL09142
- Susy (Olivia Susan) Clemens to Louise Brownell, 21 April 1892 · Rome, Italy · UCCL09140
- Susy (Olivia Susan) Clemens to Louise Brownell, 29 April 1892 · Rome, Italy · UCCL09141
- Susy (Olivia Susan) Clemens to Louise Brownell, 29 May 1892 · Venice, Italy · UCCL09143
- Susy (Olivia Susan) Clemens to Louise Brownell, July–August? 1892 · Bad Nauheim, Germany? · UCCL09131
- Susy (Olivia Susan) Clemens to Louise Brownell, August 1892 · Bad Nauheim, Germany · UCCL09145
- Susy (Olivia Susan) Clemens to Louise Brownell, 18 August 1892 · Frankfurt on the Main, Germany · UCCL09144
- Susy (Olivia Susan) Clemens to Louise Brownell, 9 September 1892 · Bad Nauheim, Germany · UCCL09146
- Susy (Olivia Susan) Clemens to Louise Brownell, 19 September 1892 · Unknown place · UCCL09147
- Susy (Olivia Susan) Clemens to Louise Brownell, 25 September 1892 · Florence, Italy · UCCL09148
- Olivia Susan (Susy) Clemens to Louise Brownell, 27 September 1892 · Florence, Italy · UCCL10425
- Susy (Olivia Susan) Clemens to Louise Brownell, 14 October 1892 · Florence, Italy · UCCL09149
- Susy (Olivia Susan) Clemens to Louise Brownell, 7 November 1892 · Florence, Italy · UCCL09150
- Susy (Olivia Susan) Clemens to Louise Brownell, 13 November 1892 · Florence, Italy · UCCL09151
- Susy (Olivia Susan) Clemens to Louise Brownell, 18 November 1892 · Florence, Italy · UCCL09152
- Susy (Olivia Susan) Clemens to Louise Brownell, 27 December 1892 · Florence, Italy · UCCL09153
- Susy (Olivia Susan) Clemens to Louise Brownell, 31 December 1892 · Florence, Italy · UCCL09154
- Susy (Olivia Susan) Clemens to Louise Brownell, January 1893 · Franzensbad, Germany · UCCL09155
- Susy (Olivia Susan) Clemens to Louise Brownell, March 1893 · Franzensbad, Germany · UCCL09157
- Susy (Olivia Susan) Clemens to Louise Brownell, 5 March 1893 · Florence, Italy · UCCL09156
- Susy (Olivia Susan) Clemens to Louise Brownell, April 1893 · Florence, Italy · UCCL09160
- Susy (Olivia Susan) Clemens to Louise Brownell, 3 April 1893 · Venice, Italy · UCCL09158
- Susy (Olivia Susan) Clemens to Louise Brownell, 6 April 1893 · Venice, Italy · UCCL09159
- Susy (Olivia Susan) Clemens to Louise Brownell, 8 June 1893 · Florence, Italy · UCCL09161
- Susy (Olivia Susan) Clemens to Louise Brownell, 13 June 1893 · Florence, Italy · UCCL09162
- Susy (Olivia Susan) Clemens to Louise Brownell, 28 June 1893 · Unknown place · UCCL09166
- Susy (Olivia Susan) Clemens to Louise Brownell, August 1893 · Franzensbad, Germany · UCCL09163
- Susy (Olivia Susan) Clemens to Louise Brownell, 3 September 1893 · Franzensbad, Germany · UCCL09164
- Susy (Olivia Susan) Clemens to Louise Brownell, 29 July 1894 · Fontainebleau, France · UCCL09167
- SLC to Louise Brownell, 3 September 1904 · New York, N.Y · UCCL06916
- SLC to Louise Brownell Saunders, 16 October 1906 · Dublin, N.H · UCCL07548
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