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Isaacs.1974. Abundance of pelagic fish during the 19th and 20th centuries as recorded in anaerobic sediments off the Californias. Soutar,A. and J.D. Fishery Bulletin .
[2]
Goering.1967.Uptake of new and regenerated forms of nitrogen in primary productivity. Dugdale,R.C.and J.J. Limnol. Oceanogr .