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Retaining Wall 
Name: Retaining Wall
Collection: Vogel Slide Collection
Site: Boonton Iron Works
Unit: 4
Piece: 1-30
Structure: Penstock Remains
Photo credit: Robert M. Vogel
Photo date: 1976-10-23
Notes: Stone wall with cross section of embedded penstock pipe
(Note: also visible in background of image 1-29)