00415nam a2200157Ia 4500003000900000008004100009020001800050040001600068080001700084100001600101245005200117260003200169300001500201650002200216650001900238IN-BaIIA211028s9999    xx            000 0 eng d  a0-7273-0101-2  cIIA Library  a621.391bCLA  aClark, A. P 0aAdvanced data-transmission systemscA. P. Clark  aLondonbPentech Pressc1977  axii, 427p.  aData transmission  aNASA Thesaurus