$1K7o'2>!7y!KH'_K'Xm!04!BX!JH(B. 6$1!C['VJ(B2002s - $1!Cs!F]'\I!09'Q[s (NATIONAL GEOGRAPHIC SOCIETY, 2002)
Keywords: $1'[~'R!!>4!3K!JH!6-(B; $1!Cd!3U(B--$1K7o'2>!7y!KH'_K'Xms