GC plus.Fountain Press,1956.First UK edition.Blue hardback(small stain mark on the edges of the front cover,two small nicks and dent on the edges of the cover and spine) in GC plus, no Dj cover.Illustrated with b/w photos,drawings,diagrams.Nice and clean pages with small ink marks on the outer edges,a couple of creases and nick on the edges of the pages.The book is in GC for its age with light shelf wear.112pp including appendix.