  Kelsen’s academic publications span over almost seven decades in which he published dozens of books and hundreds of articles. Only about a third of this vast literature has been translated to English. Kelsen’s two most important books on the pure theory of law are the first edition of his Reine Rechtslehre, published in 1934 and recently (2002) translated. The second edition, which Kelson published in 1960 (translated in 1967) is a considerably extended version of the first edition. In addition, most of the themes in these two books also appear in Kelsen’s General Theory of Law and State.  These three works are cited in text as follows:  