by MAO TSE-TUNG;by (Federal Republic of Germany)KARL MARX...et; by (United States)Henry Gleitman;by (Federal Republic of Germany)Karl Marx ...et; by (United States)L.W.Voxman;by (Federal Republic of Germany)H.Grauert...et al; by (United States)D.J.Newman;by (Federal Republic of Germany)A.Bachem...et al; by (United States)M.W.Zemansky;by (Federal Republic of Germany)M.W.Zemansky...et al;