00309nam a2200133 a 450000500170000002000150001708200200003210000150005224500270006725000120009426000310010630000220013770000160015920251203090454.0  a0876924674  a001.6424P,bwel  aWelsh, Jim  aIntroduction to Pascal  a2nd ed.  aDelhi: Prentice-Hallc1987  axii,307p.c23 cm.  aElder, John