"Plan of part of the Sterling Branch R.R. from the plans of the Fitchburg R.R. shewing [sic] the line as chartered and the line as located." Map. Boston: Sharp & Peirce, [1840–1849]. Norman B. Leventhal Map & Education Center, https://collections.leventhalmap.org/search/commonwealth:x059cc855 (accessed March 13, 2025).