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AmCyc Blasting - Coffer Dam and Excavation at Blossom Rock, 1879
Woodcut/drawing showing the cofferdam and excavations (verticle section) used for demolishing blossom rock in the waters near san francisco. Date: 1879.
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illustrations for “blasting” in the american cyclopædia
cofferdams
mining structures
yerba buena island
blossom rock (san francisco bay)
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