Columbia subject headings:
Atlantic herring--North Atlantic Ocean--Geographical distribution--Congresses.
Echo sounding in fishing--North Atlantic Ocean--Congresses.
Fish stock assessment--North Atlantic Ocean--Congresses.
Harvard subject headings:
Echo sounding in fishing--North Atlantic Ocean--Congresses.
Fish stock assessment--North Atlantic Ocean--Congresses.
Herring--North Atlantic Ocean--Geographical distribution--Congresses.
Princeton subject headings:
Echo sounding in fishing--North Atlantic Ocean--Congresses.
Fish stock assessment--North Atlantic Ocean--Congresses.
Herring--North Atlantic Ocean--Geographical distribution--Congresses.