Thorbecke, Willem Johan Rudolf, 1892- Mankind at the crossroads : an enquiry into the causes of the global predicaments and the means to overcome them / William J. Thorbecke. - Leyden : Dobbs Ferry, N.Y. : Sijthoff ; Oceana, 1975. - 217 p. ; 25 cm. Includes bibliographical references. ISBN: 0379002868 Subjects--Topical Terms: Civilization, Modern--1950-