TY  - GEN
AU  - Thomson, Betty Flanders
TI  - The shaping of America's heartland (The Naturalist's America)
SN  - 0395247608
PY  - 1977///
CY  - Boston
PB  - Houghton Mifflin Company
KW  - Landforms - Middle West
KW  - Botany - Middle West - Ecology
KW  - Hydrology - Middle West
ER  -