1. Some comments on the causes and effects of fire in the northern grasslands area of Canada and the nearby United States, Ca. 1750-1900.;Nelson,1971
2. Power spectra and coherence of drought in the interior plains.;Oladipo,1987
3. Variations in climate since 1602 as reconstructed from tree rings.;Fritts,1979
4. “Tree Rings and Climate.”;Fritts,1976
5. Large-scale air-sea interactions and short-period climatic fluctuations.;Namais,1981