Relief shown by hachures.; "Tinted portion shows corporate limits of Boston. Red dots repesent present sewer outlets. Red lines show proposed main drainage system."37 x 39 centimetersJPEGUMN_ALMA:9956437330001701engHeliotype Print. Co. (Boston)PublicMap of Boston 1875 : from A. Williams & Cos. map of Boston and the adjacent country, 1872Maps1875University of Minnesota