This special issue is dedicated to Paul Adrien Maurice Dirac on the occasion of his 80th birthday A. R. Marlow Announcement Pages: 755 - 756
Semiclassical expanding discrete space-times Wesley K. CobbLarry L. Smalley OriginalPaper Pages: 757 - 763
Electrodynamics: A consequence of nonlinear realizations of the Lorentz group Bill Dalton OriginalPaper Pages: 765 - 790
Generalizations of gravitational theory based on group covariance Leopold Halpern OriginalPaper Pages: 791 - 802
Covariant chronogeometry and extreme distances. III. Macro-micro relations I. E. Segal OriginalPaper Pages: 851 - 869