TY  - BOOK
AU  - WILBUR E. GARRETT, EDITOR ETC.
TI  - NATIONAL GEOGRAPHIC MARCH 1990
T2  - VOL. 177  NO.3  1990
U1  - 050.8 NG v.03 1990 
PY  - 1990///
CY  - 
PB  - NATIONAL GEOGRAPHIC SOCIETY
KW  - 连续性出版品; 期刊--NATIONAL GEOGRAPHIC
ER  -