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Image ID: 435469
Wallkill pressure tunnel. View showing "trailing" method of placing concrete in side -walls and arch in one operation. ...
NYPL Digital Gallery provides free and open access to over 800,000 images digitized from primary sources and printed rarities in the vast collections of The New York Public Library, including drawings, illuminated manuscripts, historical maps, vintage posters, rare prints and photographs, illustrated books, printed ephemera, and more.