00281nam a2200109 a 450000500170000002000150001708200160003210000220004824500470007026000350011730000190015220251203110101.0  a0415104831  a302.23bMCL  aMcLuhan, Marshall  aUnderstanding mediabthe extensions of man  aLoNew DelhionbRoutledgec1997  avi,359p.c22cm