por Ginzberg, Eli, 1911- [autor] | Carwell, Joseph [colaborador].
por Ginzberg, Eli, 1911- [autor].
por Columbia University. Seminar on Technology and Social Change | Ginzberg, Eli, 1911- [editor] | Esteve, Martin [traductor].
por Ginzberg, Eli, 1911- [autor] | Hiestand, Dale L [autor].
por Ginzberg, Eli, 1911- [autor] | Bray, Douglas Weston [autor] | Conservation Human Resources Project (Columbia University).