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k) Mining Booms. Most Profitable+Longest-Sustained Was Borax Mining - The Famous 20-Mule-Team Wagons (Transport).JPG
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%20Mining%20Booms.%20Most%20Profitable%2BLongest-Sustained%20Was%20Borax%20Mining%20-%20The%20Famous%2020-Mule-Team%20Wagons%20(Transport).JPG "k) Mining Booms. Most Profitable+Longest-Sustained Was Borax Mining - The Famous 20-Mule-Team Wagons (Transport).JPG")