TY  - BOOK
AU  - CHRIS JOHNS, EDITOR IN CHIEF
TI  - NATIONAL GEOGRAPHIC APR 2008
U1  - 050.8 NG v.04 2008 
PY  - 2008///
CY  - 
PB  - THE NATIONAL GEOGRAPHIC SOCIETY
KW  - 连续性出版品; 期刊--NATIONAL GEOGRAPHIC
ER  -