File:Group System poster Dec 1915.jpg
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![File:Group System poster Dec 1915.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/b/be/Group_System_poster_Dec_1915.jpg/400px-Group_System_poster_Dec_1915.jpg?20120512072812)
Size of this preview: 400 × 600 pixels. Other resolutions: 160 × 240 pixels | 483 × 724 pixels.
Original file (483 × 724 pixels, file size: 91 KB, MIME type: image/jpeg)