- FondsSylvester - Papers of James Joseph Sylvester
- SeriesBox 2-7 - Letters
- SubseriesBox 2-3 Folder 2-9 - Letters to JJS
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- Item137 - A.L.s., from Francis Cranmer Penrose
- File138-139 - A.Ls.s, in German, from Julius Petersen, Copenhagen
- Item140 - A.L.s., from Campbell W. Pinkney
- Item141 - A.L.s., from Frederick Pollock F. R. S.
- Item142 - A.L.s., from Frederick Pollock (B. A. Trinity 1867)
- Item143 - A.L.s., from William Frederick Pollock
- Item144 - A.L.s., from Charles Pritchard
- Item145 - A.L.s., from Samual Roberts
- Item146 - A.L.s., from Alfred Robmin
- 45 more...