- Islandora Repository
- Mss.B.B61_K
- Keppel, Frederick P.: To Boas. 1910 Apr. 14
- Keppel, Frederick P.: To Boas. 1910 Feb. 16
- Keppel, Frederick P.: To Boas. 1910 Feb. 23
- Keppel, Frederick P.: To Boas. 1910 Feb. 5
- Keppel, Frederick P.: To Boas. 1910 June 30
- Keppel, Frederick P.: To Boas. 1910 May 28
- Keppel, Frederick P.: To Boas. 1910 Sept. 15
- Keppel, Frederick P.: To Boas. 1914 Nov. 5
- Keppel, Frederick P.: To Boas. 1915 Feb. 11
- Keppel, Frederick P.: To Boas. 1916 Oct. 13
- Keppel, Frederick P.: To Boas. 1917 Apr. 16
- Keppel, Frederick P.: To Boas. 1917 Dec. 5
