I. Bucur ... [et al.] ; edited by F.W. Lawvere. J. Glimm ... [et al.] ; edited by C.T. Taam. R.M. Dudley ... [et al.] ; edited by C.T. Taam. [by] M. Barr ... [et al.] ; edited by S. MacLane. W. Arendt ... [et al.] ; edited by R. Nagel. M.F. Atiyah ... [et al.] ; edited by C.T. Taam. [by] H. Applegate ... [et al.] ; edited by S. MacLane.