1. The concept of seed dormancy;Amen;American Scientist,1963
2. Woodland subsistence and settlement in west central Illinois;Asch,1979
3. Paleoethnobotany of the Koster site;Asch;Illinois State Museum, Reports of Investigations,1972
4. Seed Preservation and Longevity;Barton,1961
5. Twenty Years of Seed Research at Boyce Thompson Institute for Plant Research;Barton,1948