[by] Ray Allen Billington, with the collaboration of James Blaine Hedges. Theodore M. Bernstein ; with the collaboration of Jane Wagner. by Sterling Seagrave with the collaboration of Peggy Seagrave. prepared by Valentine Herman, with the collaboration of Francoise Mendel. Dieter Schmidt ; with the collaboration of Lee Seldon. Georg P. Muller with the collaboration of Volker Bornschier. R. Creighton Buck, with the collaboration of Ellen F. Buck. by Renato Constantino, with the collaboration of Letizia R. Constantino.