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Scientific American 1899-10-21

ScientificAmerican1899-10-21.jpg Scientific American 1897-09-18ThumbnailsScientific American 1897-09-18ThumbnailsScientific American 1897-09-18ThumbnailsScientific American 1897-09-18ThumbnailsScientific American 1897-09-18Thumbnails

The new Philadelphia subway and tunnel. 40-inch water pipes. Reconstruction of part of the Baldwin Locomotive Shops. View in tunnel.



Source: Steve Kirch, collector, and creator of a great website about SCIENTIFIC AMERICAN in the past

Restoration by: magscanner