by D. C. Peaslee and H. Mueller. by J.W. Weller and A. Youle. by M. W. Porter and R. C. Spiller. by J. S. Brimacombe and J. M. Webber. [by] G. E. Mueller and E. R. Spangler. by J. E. Gowan and T. S. Wheeler. by R. R. Race and Ruth Sanger.