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New York City (NY) Law Enforcement - The RadioReference Wiki
NYPD Identifiers - RadioReference.com Forums
NYPD Supervisor & Highway Patrol Callsigns - RadioReference.com Forums
NYPD Call Signs - RadioReference.com Forums
Understanding NYPD Radio - radio12.org
FCC Callsign: KUE800 (NEW YORK CITY POLICE DEPARTMENT) - RadioReference.com
NYPD Signal Codes - N2NOV
Police Radio 10-Codes - Police Codes
Code Deciphering : r/policescanner - Reddit