RT Book, Whole SR Electronic DC OPAC T1 Five hundred mathematical challenges A1 Barbeau, Edward FD 1995 K1 Mathematics - General PB Mathematical Association of America SN 9780883855195 NO 書誌ID=OB00974080; LK [E Book]https://ebookcentral.proquest.com/lib/icujp1-ebooks/detail.action?docID=3330340