"Alaska." . . "Goldlagerstätte." . . . . . . . . . "Gold placers of the Circle district, Alaska"@en . . . . . . . "Gold placers of the Circle district, Alaska past, present, and future"@en . . "Gold placers of the Circle District, Alaska"@en . "Circle district, Alaska"@en . "Circle district, Alaska" . . . . . . . . . . . . . "Gold Placers of the Circle District, Alaska - Past, Present, and Future"@en . . . . . . . . "Gold placers of the Circle district, Alaska : past, present, and future" . . "This history of placer mining of the gold deposits of east central Alaska, near the town of Circle, covers its development from 1893 to date and includes a summary of the regional geology and of the gravels of each creek." . . . . "Gold placers of the Circle District, Alaska : past, present and future" . "Geologia - Alaska." . . "Geology." . . "Geology Alaska." . . "Oro - Giacimenti - Alaska." . . "Circle (Alas., Region)" . . "Placer deposits." . . "Placer deposits Alaska." . . "Geological Survey (U.S.)" . . "Geological Survey (U.S.)," . "Gold ores Alaska." . . "Gold ores." . .