by (United Kingdom)A.J.T.Colin;by (United States)T.Cope; by (United Kingdom)E.T.Copson;by (United States)F.John; by (United Kingdom)A.I.Vogel;by (United States)W.Kemp; by (United Kingdom)P.D.B.Collins; (United States)H.Mitter; by (United Kingdom)A.J.Thomson;by (United States)C.Wheeler; by (United Kingdom)A.Dodd;by (United States)T.Jech; by (United Kingdom)A.D.Gordon;by (United States)H.Heyer; by (United Kingdom)A.E.Schoflon;by (United States)G.E.Myers; by (United Kingdom)E.W.Colvin;by (United States)D.Seyferth; by (United Kingdom)A.Jennings;by (United States)R.C.Ward;