- CollectionDX19 - Cotton Family Papers
- SeriesC - Francis Cotton : Family and general correspondence, personal papers : 66 to 133
- Sub-seriesFamily Correspondence
- Item67 - Thomas Cotton and his brother Francis
- Sub-item1 - Letter Francis to Thomas Cotton
- Sub-item2 - Letter Francis to Thomas Cotton
- Sub-item3 - Letter Thomas to Francis Cotton
- Sub-item4 - Letter Thomas to Francis Cotton
- Sub-item5 - Remembrance Card Thomas Cotton