File:USGS Isle Royale geologic map.png
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![File:USGS Isle Royale geologic map.png](https://upload.wikimedia.org/wikipedia/commons/thumb/c/c3/USGS_Isle_Royale_geologic_map.png/800px-USGS_Isle_Royale_geologic_map.png?20170507161813)
Size of this preview: 800 × 487 pixels. Other resolutions: 320 × 195 pixels | 640 × 390 pixels | 1,024 × 624 pixels | 1,440 × 877 pixels.
Original file (1,440 × 877 pixels, file size: 1.04 MB, MIME type: image/png)