Rondout pressure tunnel Section of steel interlining in place to reinforce concrete lining at a mud seam Contract 12 October 20, 1911 A collection of separate photographs accompanied by a typewritten, classified list of titles. Acc. Hdq. N. 1609; Rondout pressure tunnel. Section of steel interlining in place to reinforce concrete lining at a mud seam. Contract 12. October 20, 1911.

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