1. Landsberg, H. E.: ‘Man-Made Climatic Changes’, Science 170, 1265–1264 (1970).
2. Livingstone, D. A.: ‘Speculations on the Climatic History of Mankind’, Am. Scientist 59, 332–337 (1971).
3. Robinson, G. D.: Long-Term Effects of Air Pollution, A Survey Center of Environment and Man, CEM, p. 4029 (1970).
4. NCAR Quarterly No. 27;National Center for Atmospheric Research,1970
5. Chapter 5 in First Annual Report;Council on Environmental Quality,1970