6 books
Selected Writings of C.F.W. Walther Volume 1 Law and Gospel
Selected Writings of C.F.W. Walther Volume 2 Selected Sermons
Selected Writings of C.F.W. Walther Volume 3 Editorials from Lehre und Wehre
Selected Writings of C.F.W. Walther Volume 5 Walther on the Church
Selected Writings of C.F.W. Walther Volume 4 Convention Essays
Selected Writings of C.F.W. Walther Volume 6 Selected Letters