TY  - BOOK
AU  - WILLIAM L. ALLEN EDITOR ETC
TI  - NATIONAL GEOGRAPHIC MARCH 1998
T2  - VOL. 193 NO.3 1998
SN  - ISSN 0027-9358
U1  - 050.8 NG v.03 1998 
PY  - 1998///
CY  - U.S.A.
PB  - NATIONAL GEOGRAPHIC SOCIETY
KW  - 连续性出版品; 期刊--NATIONAL GEOGRAPHIC
ER  -