File:Harvard Square - excavating for temporary 36-inch main to allow for subway construction, Boylston and Brattle Streets, Cambridge, Metropolitan Water and Sewerage Board, May 18, 1910, from the Digital Commonwealth - commonwealth cr56n390.jpg
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![File:Harvard Square - excavating for temporary 36-inch main to allow for subway construction, Boylston and Brattle Streets, Cambridge, Metropolitan Water and Sewerage Board, May 18, 1910, from the Digital Commonwealth - commonwealth cr56n390.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/5/5b/Harvard_Square_-_excavating_for_temporary_36-inch_main_to_allow_for_subway_construction%2C_Boylston_and_Brattle_Streets%2C_Cambridge%2C_Metropolitan_Water_and_Sewerage_Board%2C_May_18%2C_1910%2C_from_the_Digital_Commonwealth_-_commonwealth_cr56n390.jpg/788px-thumbnail.jpg?20220709163455)
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