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-- See Also the narrower term Chemical detectors
Here are entered works on apparatus used to detect the presence or absence of chemicals on a relatively gross scale in industrial processes, environmental protection, etc.

-- See Also the narrower term Fire detectors

-- See Also the narrower term Infrared detectors

-- See Also the narrower term Leak detectors

-- See Also the narrower term Metal detectors

-- See Also the narrower term Microwave detectors

-- See Also the narrower term Military surveillance

-- See Also the narrower term Nuclear counters

-- See Also the narrower term Proximity detectors

-- See Also the narrower term Radar

--subdivision Radar under individual wars, e.g. World War, 1939-1945--Radar

-- See Also the narrower term Radio detectors

-- See Also the narrower term Remote sensing
Here are entered works on the theory or methodology of collecting and gathering images of distant objects or property. Works on handling, maintaining, and indexing remote-sensing images in unbound collections are entered under Remote-sensing images.
--subdivision Remote sensing under topical headings

-- See Also the narrower term Sonar

-- See Also the narrower term Target acquisition

-- See Also the narrower term Ultraviolet detectors