Unidentified photographer / artist, 1850, Distortions of the Spine, Book page, Google Books, LL/35180
Unidentified photographer / artist 1850 Distortions of the Spine
Book page Google Books Henry Hall Sherwood The Motive Power of the Human System with the Duodynamic Symptoms of Chronic Diseases, Sixteenth edition (New York, 1850), p.195, figs1,2.
