Our Understanding Ulcers chart defines what an ulcer is.Clearly labeled illustrations show:anatomy of the stomach, esophagus,and duodenum and location in the bodycross section views of esophagus, duodenum, and stomach layersdiagrams showing what causes ulcers cross section views and photographs of the types of ulcers (erosion, acute and perforating)illustrates how ulcers healdetail of h.pyloriMade in USAAvailable in the following versions: 20" x 26" heavy weight paper laminated with grommets at top corners ISBN 9781587793707 20" x 26" heavy weight paper ISBN 9781587793714