TY  - MPI
TI  - Great lakes
T2  - The making of America
VL  - 15
PY  - 1987///
CY  - Washington (DC)
PB  - National Geographic Society
KW  - Cartografia
KW  - 912=111
PB  - National Geographic Society
SP  - 1 mapa color.
PP  - Washington (DC)
ER  -