- Islandora Repository
- Mss.B.B61_H
- Hantzsch, Bernard: To Boas. 1907
- Hantzsch, Bernard: To Boas. 1907 Dec. 31
- Hantzsch, Bernard: To Boas. 1908 Aug. 18
- Hantzsch, Bernard: To Boas. 1908 Aug. 22
- Hantzsch, Bernard: To Boas. 1908 Mar. 1
- Hantzsch, Bernard: To Boas. 1908 Mar. 29
- Hantzsch, Bernard: To Boas. 1908 May 17
- Hantzsch, Bernard: To Boas. 1908 May 9
- Hantzsch, Bernard: To Boas. 1908 Sept. 20
- Hantzsch, Bernard: To Boas. 1908 Sept. 3
- Hapgood, Norman: From Boas. 1936 Aug. 3
- Hapgood, Norman: To Boas. 1936 July 2
