1. Potamogetonaceae fruits. I. Recent and sub-fossil endocarps of the Fennoscandian species;Aalto;Acta Bot. Fenn.,1970
2. Particle-size analysis of soils;American Society for Testing Materials;ASTM Test Standard,1970
3. Berch , S. M. Warner B. G. 1982 Late Quaternary fossil chlamydospores of Glomus (Endogonaceae: Zygomycetes) from Ontario
4. Paleobotany of Wisconsinan interstadials, eastern Great Lakes region, North America;Berti;Quaternary Res.,1975
5. Plant macrofossils in Quaternary lake sediments;Birks;Ergeb. der Limnol.,1980