1. Problems in the Quaternary phytogeography of the Great Lakes region;Cushing,1965
2. On the theory of pollen analysis;Davis;Am. J. Sci.,1963
3. A method for determination of absolute pollen frequency;Davis,1965
4. Phytogeography and palynology of northeastern United States;Davis,1965
5. Determination of absolute pollen frequency;Davis;Ecology,1966