The Mining Industry.
Gold, tin, petroleum, and yes, whatever precious minerals you can dig out from the surface (and center) of the earth.
This is one of my favorite themes for the collection of postage stamps, although I am not able to find many of such stamps somehow.
Gold, tin, petroleum, and yes, whatever precious minerals you can dig out from the surface (and center) of the earth.
This is one of my favorite themes for the collection of postage stamps, although I am not able to find many of such stamps somehow.
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