TY - BOOK AU - Cole,David AU - O'Toole,Shannon AU - Liu,Yongjun TI - Shu xue xiao tian cai tan an zu. San jiao de mi mi SN - 9787531975427 U1 - 813.6 23 PY - 2022/// CY - Harbin : PB - Heilongjiang Children's Publishing House KW - Children's stories KW - Cryptograms KW - Juvenile fiction KW - Mathematics KW - Puzzles KW - School children N2 - To solve a decades-old mystery, The Math Kids need to crack a cipher. Can they do it in time? ER -