[by] Jack G. Calvert [and] James N. Pitts, Jr. by Hans R. Pruppacher and James D. Klett. by Grace E. Pickford and James W. Atz. by Michael P. West and James G. Endicott. by John W. Milnor and James D. Stasheff. by John H. Richards and James B. Hendrickson. by J. Clark, J.H. Caldon, and Ernest A. Curth.