No Copyright - United States
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No known restrictions on use.
Notes:
Title supplied by cataloger.
Print in album volume MDWSC, Contract 14, Wachusett-Coldbrook Tunnel, Tunnel East and Shaft 1, Volume 3, Secretary set
Typed on back: One yd. mixer and concrete gun in operation about 4200 feet west of Shaft 2, 6 in. discharge line from gun at track level. As the concrete lining advances, a length of this discharge line is removed and the gap closed by removing the remainder of the line toward the gun.
Notes (acquisition):
Massachusetts Metropolitan District Commission; Massachusetts Department of Conservation and Recreation