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Chapter 
13.  Data Communication Systems
 
Section 1.  General
 
13-1-1. 
 TYPES OF DATA ACCEPTABLE ON FAA DATA COMMUNICATIONS 
SYSTEMS 
13-1-2. PRIORITY 
MESSAGES  
13-1-3. GROUP CODES  
13-1-4. MESSAGE FORMATS 
 
13-1-5. WMSCR NEGATIVE RESPONSE MESSAGES  
13-1-6. Q SIGNALS 
 
  
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