by Robert K. Brayton ... [et al.]. by Robert M. Johnston ... [et al.]. by Robert E. Baldwin ...[et al.]. by Robert F. Trapp ...[et al.]. by Robert E. Burk ...[et al.]. by Robert U. Ayres ... [et al.]. H. Robert Horton ... [et al.]. by R. M. Dayton ...[et al.]. by Robert V. Pole ...[et al.]. by Richard W. Brislin ... [et al.].