Columbia subject headings:
Radiation--Measurement--Congresses.
Radiation--Measurement--Instruments--Congresses.
Radiation--Remote sensing--Congresses.
Remote sensing--Equipment and supplies--Congresses.
Harvard subject headings:
Nuclear counters--Congresses.
Radiation--Measurement--Instruments--Congresses.
Radiation--Remote sensing--Congresses.
Princeton subject headings:
Nuclear counters--Congresses.
Radiation--Measurement--Instruments--Congresses.
Radiation--Remote sensing--Congresses.