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The Refugio Valley
Rocks, Soils, Hills and Valleys
Estuary and Watershed
Human Settlement
Rails, Piers and Roads
The Hercules Powder Works
Explosives and the Second Industrial Revolution
Commerce in Explosive Products
Operation and Development of the Hercules Works
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“Historic US 40 Route” Sign Project
Seeking Information on Ceramic Acid Vessels
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City Hall
Places Today
New City Hall
Entrance and plaza of New City Hall
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Explosives Industry
Giant Powder
Rock House Canyon - “Cradle of US Dynamite Industry”
Contemporary photo with cutline describing location of Giant Powder Works in Rock House Canyon, San Francisco.
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California Powder Works
Ownership-Works
California Powder Works - Santa Cruz
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