- Islandora Repository
- Mss.B.B61_K
- Keppel, Frederick P.: To Boas. 1931 Dec. 8
- Keppel, Frederick P.: To Boas. 1931 Jan. 2
- Keppel, Frederick P.: To Boas. 1931 Mar. 10
- Keppel, Frederick P.: To Boas. 1931 Mar. 25
- Keppel, Frederick P.: To Boas. 1933 Nov. 24
- Keppel, Frederick P.: To Boas. 1933 Oct. 11
- Keppel, Frederick P.: To Boas. 1934 Apr. 30
- Keppel, Frederick P.: To Boas. 1934 Mar. 1
- Keppel, Frederick P.: To Boas. 1935 Dec. 31
- Keppel, Frederick P.: To Boas. 1937 June 28
- Keppel, Frederick P.: To Boas. 1937 June 7
- Keppel, Frederick P.: To Boas. 1938 Nov. 14
