Rondout pressure tunnel Placing concrete in excavated mud seam in the rock above the tunnel lining Contract 12 July 20, 1911 A collection of separate photographs accompanied by a typewritten, classified list of titles. Acc. Hdq. N. 1536; Rondout pressure tunnel. Placing concrete in excavated mud seam in the rock above the tunnel lining. Contract 12. July 20, 1911.

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