00337    a2200109   450000500170000002000180001708200180003510000190005324500470007226000390011930000690015820250618090143.0  a0-205-06965-7  aLM 512.72 BUR  aBURTON, D. M.   aElementary number theory: Revised printing  aLondon, bAllyn and Bacon, c1980.  avii, 390p.: ill.; figures, tables. bIndex & reference, c23cm.