Statistics for occurrence #1 of “William A. Sanborn” in chapter 6, page 20 of Historic leaves, volume 1, April, 1902 - January, 1903:

...entatives of the original brickmakers on the Ten Hills Farm. Joseph P. Sanborn manufactured near the corner of Austin street and the turnpike, being the nearest yard to the toll-house. His son, William A. Sanborn , succeeded to the business of his father, and has the distinction of being the last maker of bricks, not only along the turnpike, but anywhere in Somerville. His yard has but just been cleared up, ...
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William A. Sanborn 21 18 1 0 0 user votes

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