1. A new method for the estimation of absolute microfossil numbers, with reference especially to diatoms;Battarbee;Limnol. Oceanogr.,1973
2. Beaver, J.1981. Apparent ecological characteristics of some common freshwater diatoms. Ontario Ministry of the Environment Rexdale, Ontario.
3. The physical effect of the Great Lakes on tributaries and wetlands;Bedford;J.Great Lakes Res.,1992
4. Calculation of pollen and spore density in sediments by addition of exotic pollen in known quantities;Benninghoff;Pollen et Spores,1962
5. Pollen analysis and pollen diagrams;Berglund,1986