MINES AND MINING IN ALL PARTS OF THE WORLD—CAVES AND THEIR MYSTERIES—FAMOUS TUNNELS—DOWN IN THE DEPTHS OF THE SEA. VOLCANOES AND THEIR ERUPTIONS—PETROLEUM—UNDERGROUND LIFE OF MAN AND THE LOWER ANIMALS. SUBTERRANEAN WORKS OF THE ANCIENTS. BURIED TREASURES, ETC., ETC. _Author of “Overland through Asia,” “Life and Adventures in the Orient,” “Camp-Fire and Cotton-Field,” “The Boy Exiles,” etc._…
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