TY  - BOOK
AU  - WILLIAM GRAVES, EDITOR ETC.
TI  - NATIONAL GEOGRAPHIC JANUARY 1991
T2  - VOL. 179 NO.1  1991
U1  - 050.8 NG v.01 1991 
PY  - 1991///
CY  - 
PB  - NATIONAL GEOGRAPHIC SOCIETY
KW  - 连续性出版品; 期刊--NATIONAL GEOGRAPHIC
ER  -