The second edition was published in paperback; it adds some more recent research of Robert Steinberg on Petrie polygons and the order of Coxeter groups, appends a new definition of polytopes at the end of the book, and makes minor corrections throughout.
The second edition was released in paperback format; this version includes updated studies by Robert Steinberg on Petrie polygons and the sequence of Coxeter groups, adds a fresh perspective on polytopes towards the conclusion of the text, and includes minor revisions throughout.