00325pam a2200145a 44500008004100000020000900041041001200050082000900062100001900071245002900090250000600119260003700125300000800162650000900170230515b1980    xxu||||| |||| 00| 0 eng d  aNULL  aENGLISH  aN.D.  aSchaums Series  aElectronic Communication  a0  aNULLbMcGraw Hill Book Co.c1980  a138  aNULL