File:Massachusetts Avenue and Prospect Street, relocating 48-inch main for Boston Elevated Railway subway, Cambridge, Mass., by Metropolitan Water and Sewerage Board, Nov. 10, 1909, from the Digital Commonwealth - commonwealth c534g025v.jpg
![File:Massachusetts Avenue and Prospect Street, relocating 48-inch main for Boston Elevated Railway subway, Cambridge, Mass., by Metropolitan Water and Sewerage Board, Nov. 10, 1909, from the Digital Commonwealth - commonwealth c534g025v.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Massachusetts_Avenue_and_Prospect_Street%2C_relocating_48-inch_main_for_Boston_Elevated_Railway_subway%2C_Cambridge%2C_Mass.%2C_by_Metropolitan_Water_and_Sewerage_Board%2C_Nov._10%2C_1909%2C_from_the_Digital_Commonwealth_-_commonwealth_c534g025v.jpg/781px-thumbnail.jpg?20220709174424)
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