1. Urban and Rural America: Policy for Future Growth;Advisory Commission on Intergovernmental Relations,1968
2. Scarcity and Growth;Barnett,1963
3. City size distribution and central place hierarchy, an alternative approach;Beckmann;Journal of Regional Science,1970
4. Trends in the World Aluminium Industry;Brubaker,1966
5. Resources and Man;Committee on Resources and Man, National Academy of Sciences-National Research Council,1969