Blar i Brage IMR på forfatter "Bjerkan, Paul"
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Age, maturity and quality of North Sea herrings : during the years 1910-1913
Bjerkan, Paul (Report on Norwegian Fishery and Marine Investigations;vol 3 no 1, Research report, 1917) -
The young herring of the North Sea : a contribution to the knowledge about the younger age-groups
Bjerkan, Paul (Report on Norwegian Fishery and Marine Investigations;vol 3 no 2, Research report, 1918)