Mast Cells United: A Holistic Approach Mast Cell Activation Syndrome MCAS Walker Condition: Used, No writing, highlighting, or page creases found. Back cover has a top corner bend and bottom corner wear. Please view all photos. Smoke-Free ECONOMY SHIPPING with tracking PLEASE VIEW ALL PHOTOS FOR A BETTER VISUAL DESCRIPTION OF THE ITEM Vintage and used items may have flaws. A diligent effort is made to research and describe each item accurately and note any flaws, but I am not an expert on many of the items sold and it is possible I might miss something. Please review all photos carefully and read the item description. Feel free to message me with any further questions - Please ask questions prior to purchasing. ~ Thank you! ~