Geo. H. Walker & Co. "Map showing drives from the Walker-Gordon Laboratory, 203 Claredon St., Boston, to the Laboratory Farm in Wellesley." Map. Boston, Mass: Geo. H. Walker & Co., [ca. 1891]. Norman B. Leventhal Map & Education Center, https://collections.leventhalmap.org/search/commonwealth:wd376694j (accessed May 13, 2024).