TY  - BOOK
AU  - Thomson,Betty Flanders
TI  - The shaping of America's heartland: the landscape of the Middle West 
SN  - 0395247608
AV  - GB428.M52 T46
U1  - 551.4/0977 
PY  - 1977///
CY  - Boston
PB  - Houghton Mifflin
KW  - Landforms
KW  - Middle West
KW  - Plant ecology
KW  - Hydrology
N1  - Includes bibliographical references and index
UR  - http://www.archive.org/details/shapingofamerica00thom
UR  - http://www.openlibrary.org/books/OL4542430M
ER  -