With a foreword by Edwin Gregory. With a foreword by H. Berry. With a foreword by Edward Wisser. With a foreword by Alan N. Drury. with a foreword by A. D. Baxter. With a foreword by Edward Hughes. With a foreword by H. E. Taylor. with a foreword by Peter Debye. with a foreword by John Cockcroft. With a foreword by Gordon Radley.