1. Code of stratigraphic nomenclature;American Commission on Stratigraphic Nomenclature,1970
2. Cluster analysis for applications;Anderberg,1973
3. Numeric examination of multivariate soil samples;Anderson;Jour. Math. Geology,1971
4. Late Wisconsin vegetational and climatic history at Kylen Lake, northeastern Minnesota;Birks;Quaternary Res.,1981
5. Numerical zonation, comparison and correlation of Quaternary pollen-stratigraphical data;Birks,1986