TY  - BOOK
AU  - WILLIAM L. ALLEN EDITOR ETC
TI  - NATIONAL GEOGRAPHIC JULY 2000
T2  - VOL.198, NO.1 2000
U1  - 050.8 NG v.07 2000 
PY  - 2000///
CY  - 
PB  - NATIONAL GEOGRAPHIC SOCIETY
KW  - 连续性出版品; 期刊--NATIONAL GEOGRAPHIC
ER  -