by (United Kingdom)W.Z.black...et al;by (USSR)O.V.Chernyak; by (United Kingdom)F.W.Sears...et al;by (USSR)I.V.Savelyev; by (United Kingdom)W.G.Richards...et al;by (USSR)Y.K.Syrkin; by (United Kingdom)A.C.Clarke...et al;by (United Kingdom)J.Cary; by (United Kingdom)G.Mosback...et al;by (United States)G.H.Muller; by (United Kingdom)M.A.West...et al;by (United States)J.D.Coyle; by (United Kingdom)R.G.Cull...et al;by (United States)E.F.Dolan; by (United Kingdom)T.B.Akrill..et al;by (United Kingdom) by (United Kingdom)W.A.Coupe...et al;by (United Kingdom)S.M.Sevmour; by (United Kingdom)J.E.Oleksy...et al;by (United Kingdom)F.A.Thompson;