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"Gold mines and mining" » "Gold mine and mining" (擴展搜索)
"Gold lines and mining" » "Gold lives and mining" (擴展搜索), "Gold line and mining" (擴展搜索), "Gold lies and mining" (擴展搜索)
"Gold mines and mining" » "Gold mine and mining" (擴展搜索)
"Gold lines and mining" » "Gold lives and mining" (擴展搜索), "Gold line and mining" (擴展搜索), "Gold lies and mining" (擴展搜索)
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Statistics of mines and mining in the states and territories west of the Rocky mountains;Government Document Serial出版 1869