References
- BASSETT , I. L. and TERASMAE , J. 1962 . Ambrosia species, in Canada and their history in postglacial time . Canadian Journal of Botany , 40 : 141 – 150 .
- BIRKS , H. H. , WHITESIDE , M. C. , STARK , D. M. and BRIGHT , R. C. 1976 . Recent paleolimnology of three lakes in northeastern Minnesota . Quaternary Research , 6 : 249 – 272 .
- BIRKS , H. J.B. 1976 . Late‐Wisconsinan vegetational history of Wolf Creek, central Minnesota . Ecological Monographs , 46 : 395 – 429 .
- BRUGAM , R. B. 1978 . Pollen indicators of land‐use change in southern Connecticut . Quaternary Research , 9 : 349 – 362 .
- CRAIG , A. J. 1972 . Pollen influx to laminated sediments: a pollen diagram from northeastern Minnesota . Ecology , 53 : 46 – 57 .
- CUSHING , E. J. 1963 . Late‐Wisconsin pollen stratigraphy in east‐central Minnesota 165 Minneapolis, Minnesota Ph.D. Thesis. Univ
- _____ . 1967 . “ Late‐Wisconsin pollen stratigraphy and the glacial sequence in Minnesota ” . In Quaternary Paleoecology. , Edited by: Cushing , E. J. , Wright , H. E. and Jr. 59 – 88 . New Haven : Yale Univ. Press .
- DAVIS , M. B. 1976 . Erosion rates and land‐use history in southern Michigan . Environmental Conservation , 3 : 139 – 148 .
- DURKEE , L. H. 1971 . A pollen profile from Woden Bog in north‐central Iowa . Ecology , 52 : 835 – 844 .
- FAEGRI , K. and IVERSEN , J. 1975 . Textbook of Pollen Analysis. , 295 New York : Hafner Press .
- FERNALD , M. L. 1959 . Gray's Manual of Botany. , 1632 New York : D. Van Nostrand .
- FRIES , M. 1962 . Pollen profiles of late Pleistocene and Recent sediments from Weber Lake, northeastern Minnesota . Ecology , 43 : 295 – 308 .
- GODWIN , H. 1967 . Pollen‐analytic evidence for the cultivation of Cannabis in England . Review of Palaeobotany and Palynology , 4 : 71 – 80 .
- GRÜGER , J. 1973 . Studies on the Late Quaternary vegetation history of northeastern Kansas . Geological Society of America, Bulletin , 84 : 239 – 250 .
- HULL , J. A.T. 1883 . Census of Iowa for 1880. 744 Des Moines, , State of Iowa
- LEWIS , I. F. and COCKE , E. C. 1929 . Pollen analysis of Dismal Swamp . Jour. Elisha Mitchell Science Society , 45 : 37 – 58 .
- MAHER , L. J. and JR. 1972 . Absolute pollen diagram of Redrock Lake, Boulder County, Colorado . Quaternary Research , 2 : 531 – 553 .
- _____ . 1977 . Palynological studies in the western arm of Lake Superior . Quaternary Research , 7 : 14 – 44 .
- McANDREWS , J. H. 1976 . Fossil History of man's impact on the Canadian flora: An example from southern Ontario . Canadian Botanical Association Bulletin Supplement , 9 : 1 – 6 .
- McANDREWS , J. H. , BERTI , A. A. and NORRIS , G. 1973 . Key to the Quaternary pollen and spores of the Great Lakes region , 17 Life Science Miscellaneous Publications, Royal Ontario Museum .
- MILLER , N. G. 1970 . The genera of the Cannabaceae in the southeastern United States . Jour. Arnold Arboretum , 51 : 185 – 203 .
- MOSIMANN , J. E. , Kummel , B. and Raup , D. 1965 . “ Statistical methods for the pollen analyst ” . In Handbook of Paleontological Techniques. , 636 – 673 . San Francisco : Freeman .
- RICHARD . 1970 . Atlas pollinque des arbres et de quelque arbustes indigenes du Quebec; I, II, III, IV . Naturaliste Canadien , 97 ( 1–34 ) : 97 – 161 . 241 – 306 .
- SEARS , P. B. 1938 . Climatic interpretation of postglacial pollen deposits in North America . American Meteorological Society Bulletin , 19 : 177 – 181 .
- SWAIN , A. M. 1973 . A history of fire and vegetation in northeastern Minnesota as recorded in lake sediments . Quaternary Research , 3 : 383 – 396 .
- TRUMAN , H. V. 1937 . Fossil evidence of two prairie invasions of Wisconsin . Transactions of the Wisconsin Academy of Science, Arts, and Letters , 30 : 35 – 42 .
- VAN ZANT , K. L. 1976 . Late‐ and postglacial vegetational history of northern Iowa , 123 Iowa City : Univ. of Iowa . Ph.D. Thesis
- WEBB , T. III . Pre‐ and postsettlement pollen from a short core, Blackhawk Lake, west‐central Iowa . Proceedings of the Iowa Academy of Science . Vol. 80 , pp. 41 – 44 .
- WILSON , J. 1910 . “ Report of the Secretary ” . In U.S.D.A. Yearbook, 9 – 156 . 1910