00339nam a22001217a 450000500170000000800410001704000160005804100070007405000230008124500610010426000420016530000100020720150817060426.0150817b        xxu||||| |||| 00| 0 eng d  aKYUCLcKYUC  aEN  aQA 11 b.S546 1971  aTeaching school mathematics cServais, W [and] T. Varga.  aUSA,bPenguin education-Unescoc1971.  a308p.