Egbert Torenbeek ; with a foreword by H. Wittenberg. Roger Gabriel ; with a foreword by M. D. Milne. A. J. Essex-Cater ; with a foreword by John Butterfield. J. S. Rogers ; with a foreword by T. H. Laby. Stuart A. Rosenfeld ; with a foreword by Ray Marshall. Stephen Hall ; with a foreword by Ti Liang Yang. V.I. Sreenivas ; with a foreword by C.E. Welch. by S. H. Steinberg ; with a foreword by Beatrice Warde. edited by E. Mendoza ; with a foreword by William Cooper. by Erwin Singer ; with a foreword by Esward S. Tauber.