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75" highID: 21040105Collection: The Map Man
Neighborhoods: Duxbury Center
Neighborhoods: Russellville
ID: 14328A
ID: 2022092201
BTC Report 09 1903 Plate 07: East Boston Tunnel, Lower Air Locks Step 2: Frame Option:Custom/Archival: Black Stepped 75" highID: 21040105Collection: The MapDate: March 17, 1903 Subject: East Boston Tunnel (Now MBTA Blue Line) Publisher: Boston Transit Commission Type(s): Photograph, Print Size: 9. 25" wide x 6" high ID: BIT17261 Collection: WardMaps LLC Atlas: Boston Transit Commission Annual Report 09 1903 Boston in Transit Book Figure 5. 14 Tunnel Air Locks, March 17, 1903 A pair of air locks protected the high pressure area of tunnel excavation from the East Boston side of the project. A second level
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