contributors, A.L. Delaunois ... [et al.]. contributors, J.D. Baxter...[et al.]. contributions by J. C. Boeyens ...[et al.]. contributions by L. A. Anderson...[et al.]. contributions by H. Bilz ... [et al.]. contributions from Kohlschutter ...[et al.]. contributed by E. T. G. Emery ... [et al.]. contributions from Schlosser...[et al.]. contributing editors, K.H. Hsu ... [et al.]. contributing editors, D. Hui ... [et al.].