- CollectieDX19 - Cotton Family Papers
- ReeksC - Francis Cotton : Family and general correspondence, personal papers : 66 to 133
- Family Correspondence
- Stuk69 - Francis and Anna Maria Cotton
- 1 - Anna Maria to Francis :1869
- 2 - Francis to Anna Maria : 1871
- 3 - Anna Maria to Francis :1872
- 4 - Anna Maria to Francis : undated
- 5 - Anna Maria to Francis : undated