edited by R.O. McGachie and A.G. Bradley. edited by B. McNeil and L.M. Harvey. edited by R.G. White and J.G. Walker. edited by C.R. Brundle and A.D. Baker. edited by Bill Katz and Ruth Fraley. edited by L.E. Reichl and W.C. Schieve. edited by M. J. Blackie and J. B. Dent. edited by R.O. Ritchie and J. Lankford. edited by R.W. Gellie and R.-R. Tavast. edited by C. R. Brundle and A. D. Baker.