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Pisces and Mammalia.) (R) Acad. Sci. USSR. Tbilisi, Georgia. 

 Nikitinski, W. 1933. Quantitative Bestimmung der Bodenfauna der offenen 



Stellen des Aral Sees. Refer at Aral Sea sci. station fisheries, 1 (G.s.) 

 Nikolaev, I. 1949. On the advancement of the warm water and brackwater 



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DAN, USSR, 68, 2 (R) 

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V.G.O. 3 (R) 

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Baltic Sea. Tr. Latvian VNIRO, 2 (R) 

 Nikolaev, I. 1957. The biological seasons in the Baltic Sea. Ibid. (R) 

 Nikolaev, I. and Krievs, K. 1957. Productivity and the conditions of the 



plankton development in central Baltic and in the Riga bay in 1955- 



1956. Ibid. (R) 

 Nikolsky, G. 1940. The fishes of the Aral Sea. Mat. study fauna flora USSR. 



New Series, Div. zool. 1, 16, Ed. MOIP (E.s.) 

 Novoyilova, A. 1955. The zooplankton changes in the Sea of Azov in con- 

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 Nordmann, M. 1840. Voyage dans la Russie etc. Vol. III. Observation sur 



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 Okul, A. 1940. On the method of quantitative study of plankton in the Sea 



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 Okul, A. Feeding of the plankton-eating fishes in the Sea of Azov. Ibid. 



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 Ostroumov, A. 1892. An account of the participation in the scientific voyage 



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Mem. Acad. Imp. Sci. St. -Peter sbourg, 69 {Supplement 6) (R) 

 Ostroumov, A. 1893. Voyage to the Bosphorus (ex.). Ibid. 72 {Supplement 8) 



(R) 



