Contributors: L. S. Allard [and others] Contributors: L. H. Adams [and others] Contributors: L. Angervall [and others. Contributors: P. D. Atkinson [and others] Contributors: C. M. Drew [and others] Contributors: R.W. Flux [and others] Contributors: T.E. Ivall [and others] Contributors: E. T. G. Emery [and others] Contributors: B. Adkins [and others] [Contributors]: Henry F. Allen [and others]