by R. H. Fowler and E. A. Guggenheim. by M. W. Porter and R. C. Spiller. [by] H. W. Fowler and F. G. Fowler. by A. C. Ainger and H. G. Wintle. by C.J. Cowper and A.J. DeRose. by D. F. Spooner and W. H. Grinsted. by C. Zwikker and C. W. Kosten. by J.W. Weller and A. Youle. by W. R. Schoeller and A. R. Powell.