Every reference with a DOI in the deposited reference list resolved to a known
work in Crossref or DataCite at the dated check, and none carried a publisher retraction,
withdrawal, or removal notice.
The 29 references without a DOI — listed, not checked
no DOI — not checkedBradley, R. S., 1985. Pollen analysis,in ?Quaternary Paleoclimatology-Methods of Paleoclimatic Reconstruction?. Allen & Unwin, Boston: 304?329.
no DOI — not checkedBroadhead, G. C., 1875. Chapter XII, Montgomery County. Geological Survey of Illinois Geology and Paleontology 4: 149?155.
no DOI — not checkedBryson, R. A., 1966. Air masses, streamlines and the boreal forest. Geographical Bulletin 8: 228?269.
no DOI — not checkedBryson, R. A. & W. M. Wendland, 1967. Tentative climatic patterns for some late-glacial and post-glacial episodes in Central North America,in ?Life, Land and Water? (ed. Mayer-Oaks, W. J.). Proceedings of the 1966 Conference on Environmental Studies of the Glacial Lake Agassiz Region, University of Manitoba, Winnipeg: 271?298.
no DOI — not checkedBurns, R. M. & B. H. Honkala, 1990. ?Silvics of North America?. Agriculture Handbook Volume 2. Washington D.C.
no DOI — not checkedChumbley, C. A., 1989. Late-glacial and Holocene vegetation of the Roberts Creek Basin, Northeast Iowa. Ph. D. thesis. The University of Iowa, 154 pp.
no DOI — not checkedCurry, B. B., 1995. Late Pleistocene lithofacies, paleolimnology, and ostracode fauna of kettles on the Illinoian till plain, Illinois, U.S.A. Ph.D. Dissertation, University of Illinois, 510 pp.
no DOI — not checkedFaegri & Iversen, 1975. ?Textbook of Pollen Analysis?. 3rd ed. Hafner Press, New York, 295 pp.
no DOI — not checkedFehrenbacher, J. B., G. O. Walker & H. L. Wascher, 1967. Soils of Illinois. University of Illinois, College of Agriculture, Agricultural Experiment Station Bulletin 725, 47 pp.
no DOI — not checkedFenneman, N. M., 1938. Physiography of the Eastern United States. McGraw-Hill Book Co., Inc., New York, 714 pp.
no DOI — not checkedFowells, H. A., 1965. ?Silvics of Forest Trees of the United States?. Agricultural Handbook Number 271, United States Department of Agriculture, Washington, D.C.
no DOI — not checkedHill, M. O., 1979. DECORANA-a FORTRAN program for detrended correspondence analysis and reciprocal averaging. Ecology and Systematics, Cornell University, Ithaca, New York.
no DOI — not checkedHolloway, R. G. & V. M. Bryant, Jr, 1985. Late-Quaternary pollen records and vegetational history of the Great Lakes Region: United States and Canada,in ?Pollen Records of Late-Quaternary North American Sediments?: 205?245.
no DOI — not checkedJacobs, A. M., 1970. Persistence of lake basins in southern Illinois, U.S.A, from late Illinoian time to the present. Revue Geographie Physique et Geologic Dynamique 12: 137?142.
no DOI — not checkedJacobs, A. M. & J. A. Lineback, 1969. glacial geology of the Van dalia, Illinois region. Illinois State Geological Survey Urbane Circular 442: 1?23.
no DOI — not checkedKapp, R. O., 1969, ?How to Know Pollen and Spores?. Wm. C. Brown Co. Pub. Dubuque, 249 pp.
no DOI — not checkedKim, H. K., 1986. Late-glacial and Holocene environment in central Iowa: a comparative study of pollen data from four sites. Ph.D. thesis. The University of Iowa, 134 pp.
no DOI — not checkedKüchler, A. W., 1964. ?Natural Vegetation of the Conterminous United States?. American Geographical Society Special Publication 36, 116 pp.
no DOI — not checkedMaher, L. J., 1982. The palynology of Devils Lake, Sauk County, Wisconsin,in ?History of the Driftless Areal? (ed. Knox, J. C., L. Clayton & D. M. Mickelson). University of Wisconsin Geological and Natural History Survey Field Trip Guide Book: 119?135.
no DOI — not checkedMcAndrews, J. H. 1966. Postglacial history of prairie, savanna, and forest in northwestern Minnesota. Memoirs of the Torrey Botanical Club 22: 1?72.
no DOI — not checkedMoore, P. D., J. A. Webb & M. E. Collinson, 1991. ?Pollen Analysis?. Oxford, Blackwell Scientific Publications, London, 216 pp.
no DOI — not checkedMoore, P. D. & J. A. Webb, 1978. ?An Illustrated Guide to Pollen Analysis?. John Wiley and Sons New York, 133 pp.
no DOI — not checkedNorton, E. A., R. S. Smith, E. E. Deturk, F. C. Bauer & L. H. Smith, 1932. Fayette County soils. University of Illinois Agricultural Experiment Station soil Report 52, 44 pp.
no DOI — not checkedSims, J. D., D. P. Adam & M. J. Rymer, 1981. Late Pleistocene stratigraphy and palynology of Clear Lake. Geological Survey Professional Paper 1141: 219?230.
no DOI — not checkedWaite, P. J., 1974. The climate of Iowa, in ?Climates of the States? Volume III Western States Including Alaska and Hawaii. Water Introduction Center, Inc., Water Research Building, Manhasset Isle, Port Washington, New York: 657?675.
no DOI — not checkedWatts, W. A., 1983. Vegetation history of the eastern United States 25 000 to 10 000 years ago,in ?Late-Quaternary Environments of the United States? (ed. Wright, H. E., Jr.) Volume I ?The Late Pleistocene? (ed. Porter, S. C.). University of Minnesota Press, Minneapolis: 294?310.
no DOI — not checkedWebb, T. III, E. J. Cushing & H. E. Wright, Jr. 1983. Holocene changes in the vegetation of the Midwest,in ?Late Quaternary Environments of the United States? Volume II: ?The Holocene? (ed. H. E. Wright, Jr.). University of Minnesota Press, Minneapolis: 142?165.
no DOI — not checkedWendland, W. M., K. E. Kunkel, G. C. Conner, W. L. Decker, H. Hillaker, P. Naber-Knox, F. V. Nurnberger, J. Rogers, K. Scheeringa, K. Zandlo & J. Zandlo, 1992. Mean 1961?1990 temperature and precipitation over the upper Midwest. Midwestern Climate Center Research Report 92-01, Illinois State Water Survey, Champaign, Illinois, 27 pp.
no DOI — not checkedZhu, H., 1994. Vegetation and climate of the last glacial-interglacial cycle in southern Illinois. University of Iowa Ph.D. Dissertation, 152 pp.
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