Unofficial copy, one of many Waltham historic street plans available for free online and in person through the excellent Middlesex County, Massachusetts Registry of Deeds. These historic plans in particular provide information for both sewer proposed and the frontages of the properties on the block. Note the image itself online here may be skewed, due to some oversizing of the pdf documents. No such skewing seems to be present with the downloaded files.
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"Florence Road 1949 Profile -- Proposed Sewer Assessment, City of Waltham"Please download to view full document