Hellings, P W; Scadding, G; Bachert, C; Bjermer, L; Canonica, G W; Cardell, L O; Carney, A S; Constantinidis, J; Deneyer, L; Diamant, Z; Durham, S; Gevaert, P; Harvey, R; Hopkins, C; Kjeldsen, A; Klimek, L; Lund, V J; Price, D; Rimmer, J; Ryan, D; Roberts, G; Sahlstrand-Johnson, P; Salmi, S; Samji, M; Scadding, G; Smith, P; Steinsvik, A; Wagenmann, M; Seys, S; Wahn, U; Fokkens, W J.