My English teacher recommended Zinsser's "On Writing Well" as a supplement to my reading of E.B. White's "The Elements of Style". While I know that Zinsser's 30th edition exists, I have come across an online apparition of the 35th edition: http://books.google.com/books/about/On_Writing_Well_35th_Anniversary_Edition.html?id=rIG5SgAACAAJ. Does a 35th edition of the book actually exist, or have I met a myth since I cannot find it?