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Concrete blocks
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LCSH Subjects = Concrete blocks
Hetch Hetchy Dam. Drainage wells formed of porous concrete blocks 3 ft. 3 in. square, with 15 in. square hole in center.
California Photograph Collection
Hetch Hetchy dam. Precast porous concrete blocks for drainage wells. Rock crushing plant in background
California Photograph Collection
Type of Resource
still image
(2)
Genre
Photographs
(2)
Topic
Concrete blocks
(2)
Dams--Drainage systems
(2)
Water-supply--California--San Francisco
(2)