File:OC01- Key to historical maps.jpg
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![File:OC01- Key to historical maps.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/1/18/OC01-_Key_to_historical_maps.jpg/800px-OC01-_Key_to_historical_maps.jpg?20160503162021)
Size of this preview: 800 × 595 pixels. Other resolutions: 320 × 238 pixels | 640 × 476 pixels | 1,024 × 762 pixels | 1,280 × 952 pixels | 1,800 × 1,339 pixels.
Original file (1,800 × 1,339 pixels, file size: 136 KB, MIME type: image/jpeg)