| George A. Otis Photograph Series No. 44: Gunshot Fracture of Both Parietals. Recovery. Private John W. Snyder, Co. B, 49th Pennsylvania Vols. 1867 (after) Book plate Internet Archive LL/55545 George A. Otis, 1865, Photographs of Surgical Cases and Specimens, (Washington: Surgeon General's Office)
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