Contract No. 20, Coldbrook-Swift Tunnel, Barre, Hardwick, Greenwich, looking east at Sta. 1314+94 showing forms for circular section, Quabbin Aqueduct, Hardwick, Mass., May 22, 1934

Contract No. 20, Coldbrook-Swift Tunnel, Barre, Hardwick, Greenwich, looking east at Sta. 1314+94 showing forms for circular section, Quabbin Aqueduct, Hardwick, Mass., May 22, 1934

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