TY  - SER
ED  -  National Geographic Society.
TI  -  Research reports - National Geographic Society
U1  -  910.6273 
PY  - 1861///-
CY  -  Washington, DC : 
PB  -  National Geographic Society, 
KW  -  Geography
KW  -  Periodicals
N1  -  Latest issue consulted: Vol. 13 (1971-1972)
ER  -