CONSEIL PERMANENT INTERNATIONAL POUR 
LYEXPLORATION DE LA MER \ 
_ 
RAPPORTS ET PROCES-VERBAUX 
VOLUME XX 
FLUCTUATIONS IN THE GREAT 
FISHERIES OF NORTHERN EUROPE 
VIEWED IN THE LIGHT OF BIOLOGICAL RESEARCH 
BY 
JOHAN HJORT 
WITH 3 PLATES 
EN COMMISSION CHEZ 
ANDR. FRED. HOST & FILS 
COPENHAGUE 
AVRIL 1914 
