Pathological and practical observations on spinal diseases: illustrated with cases and engravings. Also, An inquiry into the origin and cure of distorted limbs.

Harrison founded the first infirmary for spinal diseases in London.  See Weiner & Silver, "Edward Harrison and the treatment of spinal deformities in the nineteenth century," J. R. Coll. Phys. Edinb., 38 (2006) 265-71.  Digital facsimile from wellcomecollection.org at this link.