The invisible resource :

                                                                                                                
621.3841LEV
Levin, Harvey J
   The invisible resource : use and regulation of the radio spectrum / by Harvey J. Levin.- London:The Johns Hopkins Press,1971.
  xx,432p. ;22cm(Hb)
  Note: Includes bibliographical references and index
  ISBN:0801813166     Rs. 00.00

  Cen Lib/Ret /744662/ 744662 /   0.00 /sign

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