- Islandora Repository
- Mss.B.B61_H
- Hale, Horatio: To Boas. 1890 May 21
- Hale, Horatio: To Boas. 1890 May 25
- Hale, Horatio: To Boas. 1890 May 26
- Hale, Horatio: To Boas. 1890 May 7
- Hale, Horatio: To Boas. 1890 Nov. 24
- Hale, Horatio: To Boas. 1890 Nov. 3
- Hale, Horatio: To Boas. 1890 Oct. 10
- Hale, Horatio: To Boas. 1890 Oct. 20
- Hale, Horatio: To Boas. 1890 Sept. 8
- Hale, Horatio: To Boas. 1891 Apr. 8
- Hale, Horatio: To Boas. 1891 Feb. 5
- Hale, Horatio: To Boas. 1891 Jan. 12
