100年前的今天

1921年5月12日] 匹兹堡独立街和瓦巴什街的景色,显示了48英寸的混凝土下水道管道、设备和工人。
[May 12th, 1921] A view of Independence and Wabash Streets, Pittsburgh, showing 48 inch concrete sewer pipe, equipment and workers.
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