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The Refugio Valley
Rocks, Soils, Hills and Valleys
Estuary and Watershed
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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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Advertising
California Powder Works
...2 more
Advertisements of California Powder Works
Early advertisements for Hercules brand dynamite.
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Chinese Workers
Chinese Workers at Hercules
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Advertising
Advertisements During World War I
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