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library plankton

Posts tagged mining

Nov 6 '10
"By-products of Coal"
—From The Story of Our Rocks and Minerals /  by Allen White; illustrations by Robert Ayton.

"By-products of Coal"

—From The Story of Our Rocks and Minerals / by Allen White; illustrations by Robert Ayton.

Oct 18 '10
"Iron Ore Exports"
— Economic life in Sweden, p. 30.

"Iron Ore Exports"

— Economic life in Sweden, p. 30.