File:Surface Map from Saturday October 21 1916 following Black Friday.png
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![File:Surface Map from Saturday October 21 1916 following Black Friday.png](https://upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Surface_Map_from_Saturday_October_21_1916_following_Black_Friday.png/710px-Surface_Map_from_Saturday_October_21_1916_following_Black_Friday.png?20151018140836)
Size of this preview: 710 × 599 pixels. Other resolutions: 284 × 240 pixels | 569 × 480 pixels | 910 × 768 pixels | 1,213 × 1,024 pixels | 2,209 × 1,865 pixels.
Original file (2,209 × 1,865 pixels, file size: 2.82 MB, MIME type: image/png)