00288nam a2200133Ia 4500020000900000082000800009100003100017245003700048250001100085260003800096300000800134500000600142650000600148  aNULL  a510  aMahon G. E / Fisher, W. E. 0aNational Certificate Mathematics  asecond  aLondonbEnglish Universites Press  a512  a0  a-