The top outer edge is bumped; the first three pages are staine along the outer edge as is the fore-edge. It is a pink stain that may or may not have been mould, though it look quite benign. In its favour, it's unmarked and solid. Scientific Publications' Workshop Series No. 13. Title on the front cover: Falcon with specifications, repair and maintenance data, covering series -- XK, XL, XM, XP, XR. Second edition.