aaw_028 December 20, 2018February 5, 2019 Matthew Caulkins, Web Applications Program Manager Previous Next M-48. Ulmus americana Massachusetts (Boxford). Boxford Elm, 70 ft. in height, girth of trunk 14 1/2 ft., spread of branches 100 ft. Marks place where Indian Treaty was signed. Photograph by E.H. Wilson, April 12, 1924. All photographs by Ernest Henry Wilson. Copyright © President and Fellows of Harvard College, Arnold Arboretum Archives; all rights reserved.