- Islandora Repository
- Mss.B.B61_H
- Hale, Horatio: From Boas. 1889 Oct. 13
- Hale, Horatio: From Boas. 1890 Aug. 3
- Hale, Horatio: From Boas. 1890 May 5
- Hale, Horatio: From Boas. 1894 Apr. 16
- Hale, Horatio: From Boas. 1894 Apr. 3
- Hale, Horatio: From Boas. 1894 Mar. 26
- Hale, Horatio: To Boas. 1887
- Hale, Horatio: To Boas. 1887
- Hale, Horatio: To Boas. 1887 Mar. 21
- Hale, Horatio: To Boas. 1887 Mar. 28
- Hale, Horatio: To Boas. 1887 Nov. 27
- Hale, Horatio: To Boas. 1888 Apr. 25
