by Edwin Gregory ... and Eric N. Simons ... with a foreword by Mr. C. K. Everitt .. by N. H. Hartshorne ... and A. Stuart ... with a foreword by Prof. G.T. Morgan .. by R. C. Brimley and F. C. Barrett. With a foreword by E. C. Bate-Smith. by William B. Levenson ... With a foreword by I. Keith Tyler ..