Dindal, D.L. (ed.) (1990) Soil Biology guide. John Wiley and Sons, New York.
James, S.W. Oligochaeta: Megascolecidae and other earthworms from southern and midwestern North America. pp. 370-386.
Schwert, D. P. 1990. Oligochaeta: Lumbricidae. p. 341-356.
Reynolds, J.W. 1977. The earthworms (Lumbricidae and Sparganophilidae) of Ontario. Life Sciences Miscellaneous Publications, Royal Ontario Museum, 100 Queen’s Park, Toronto, Canada, M5S 2C6
Sims R. W. and Gerard B. M. (1999) Earthworms: notes for the identification of British species. The Linnean Society of London and the Estuarine and Coastal Sciences Association.
Edwards, C. A. 1998. Earthworm Ecology. St. Lucie Press, New York.
Edwards, C. A. and P. J. Bohlen. 1996. Biology and ecology of earthworms. Third edition. Chapman & Hall, New York.
Hendrix, P.F. (ed.) 1995. Earthworm ecology and biogeography in North America, CRC Press, Boca Raton, FL.
Satchell, J.E. (ed.) 1983. Earthworm Ecology: from Darwin to vermiculture. Chapman and Hall, New York.
Gleason, H.A. & A. Cronquist. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. New York Botanical Garden Bronx, NY, USA.
Voss, E.G. 1972. Michigan flora. Cranbrook Inst. of Science.
Barnes, B.V., W.H. Wagner and C.H. Otis. 1981. Michigan Trees: A Guide to the Trees of Michigan and the Great Lakes Region. University of Michigan Press.
Tryon, R. 1980. Ferns of Minnesota. University of Minnesota Press.
Smith,W.R. 1993. Orchids of Minnesota. University of Minnesota Press.
Rathke, D.M. 1996. Minnesota trees. Minnesota Extension Service. St. Paul, MN.
Jannsen, J. Minnesota Moss Atlas
Field Guide to the Birds of North America. 2002. National Geographic Society. Washington, D.C.
Baskin, C. C. and J. M. Baskin (1998) Seeds: ecology, biogeography and evolution of dormancy and germination. Academic Press, San Diego.
Lakela, O. 1965. A flora of northeastern Minnesota. University of Minnesota Press, Minneapolis
Leck, M.A., V.T. Parker and R.L. Simpson (eds.). 1989. Ecology of soil seed banks. Academic Press, San Diego, CA.
Bormann, F. H. and G. E. Likens (1979) Pattern and process in a forested ecosystem. Springer-Verlag, New York.
Frelich, L.E. (2002) Forest Dynamics and Disturbance Regimes: studies from temperate evergreen-deciduous forests. Cambridge Studies in Ecology, Cambridge University Press.
Gilliam, F. S. and M. R. Roberts (eds.) (2003) The Herbaceous Layer in Forests of Eastern North America. Oxford University Press.
Green, J. C. (1995) Birds and Forests – a management and conservation guide. Publisher – Minnesota Department of Natural Resources, 500 Lafayette Road, St. Paul, MN
Tester, J. R. (1995) Minnesota's Natural Heritage: An Ecological Perspective. University of Minnesota Press.
Yahner, R. H. (2000) Eastern deciduous forest: ecology andwildlife conservation. University of Minnesota Press, Minneapolis, MN
Mooney,H.A., H.L. Drake (1986) Ecology of biological invasions of North America and Hawaii. Springer-Verlag, New York.
Drake,J.A., H.A. Mooney, F.di Castri, F.J.Groves, F.J.Kruger, M.Rejmanek, M. Williamson (1989) Biological Invasions: a global perspective. Wiley Press, on behalf of the Scientific Committee on Problems of the Environment of the International Council of Scientific Unions, Chichester, New York.
Williamson,M. (1996) Biological invasions. Chapman-Hall, New York.
MN Department of Natural Resources (2006) Field Guide to the Native Plant Communities of Minnesota: the Eastern Broadleaf Forest Province. MN-DNR, 500 Lafayette Road, St. Paul, MN
MN Department of Natural Resources (2003) Field Guide to the Native Plant Communities of Minnesota: the Laurentian Mixed Forest Province. MN-DNR, 500 Lafayette Road, St. Paul, MN
Kotar, J. and T.L. Burger (1996) A guide to forest communities and habitat types of central and southern Wisconsin. Department of Forest Ecology and Management, University of Wisconsin - Madison, Madison, Wisconsin.
Kotar, J., J. A. Kovach and T.L. Burger (2002) A guide to forest communities and habitat types of northern Wisconsin., 2nd Edition. Department of Forest Ecology and Management, University of Wisconsin - Madison, Madison, Wisconsin.
Green, J.C. 1996. Geology on display: Geology and scenery of Minnesota’s North Shore state parks. Department of Natural Resources. St. Paul, MN.
Matsch, C. and R. Ojakangas. 1982. Minnesota’s Geology. University of Minnesota Press. Minneapolis, MN.