"Geology Tennessee Knox County." . . "Tennessee Dep. of Conservation." . . "Geological Survey (U.S.)," . . "Geology Tennessee Jefferson County." . . . . "Tennessee. Division of Geology," . . "Tennessee" . . "From 425 to 570 million years ago" . . "Zinc ores Tennessee Knox County." . . "Geology." . . "Zinc ores Tennessee Jefferson County." . . "Zinc ores." . . . . . . "Stratigraphy of the Mascot-Jefferson City zinc distric, Tennessee" . "Stratigraphy of the Mascot-Jefferson City zinc district, Tennessee"@en . . . . . . . . . . . . . . . . . . . . . . . . . . . .