No Copyright - United States
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Notes:
Title supplied by cataloger.
Print in album volume MDWSC, Contract 20, Coldbrook-Swift Tunnel Shafts 9, 10, 11, 12, Volume 1, Chief Engineer set
Typed on back: View of north wall at Sta. 1283+00 featuring small scale folding of the foliation structure as brought out by pegmatite and granite bands. Lower left portion of picture shows stringers of hornblende diorite extending into pegmatite mass. All gradations of rock from pegmatite (white) through granite (light gray) to hornblende granite and diorite (dark) can be seen. The ventilation pipe is about 14 in in diameter.
Notes (acquisition):
Massachusetts Metropolitan District Commission; Massachusetts Department of Conservation and Recreation