Columbia subject headings:
Aeronautics in police work.
Police--California--Los Angeles County.
Harvard subject headings:
Aeronautics in police work.
Crime prevention--California--Los Angeles County.
Police patrol--California--Los Angeles County--Surveillance operations.
Police patrol--Surveillance operations
Police--California--Los Angeles County.
Princeton subject headings:
Aeronautics in police work.
Police--California--Los Angeles County.