1. Adams H. B. 1882a. Letter to Daniel Coit Gilman 3 July. Herbert Baxter Adams Papers. Series 1 Box 18 Folder 2. Johns Hopkins University Libraries.
2. Adams, H. B. 1882b. The Germanic origin of New England towns. Baltimore, MD: Johns Hopkins University.
3. Adams H. B. 1882c. Tithingmen. Proceedings of the American Antiquarian Society 1:398–420.
4. Adams H. B. 1884. Letter to E.A. Freeman 1 May. Edward Augustus Freeman Papers. Series 1 Box 7 Folder 1–13. University of Manchester Library Special Collections.
5. Adams, H. B. 1894. Is history past politics?: A paper read in Baltimore, November 30, 1894. at the Sixth Annual Meeting of the Association of Colleges and Preparatory Schools in the Middle States and Maryland. Herbert Baxter Adams Papers. Series 3, Box 32, Folder 21. Johns Hopkins University Libraries.