1. Der Wetlauf zum Jahre 2000;Baade,1960
2. Land utilization in the United States: geographical aspects of the problem;Baker;The Geogr. Rev.,1923
3. Un grand exploit du parti et du peuple;Brejnev;Discours à Alma-Ata,1974
4. By Bread Alone;Brown,1974
5. Computation of the absolute maximum food production of the world;Buringh,1975