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1Publicado 1983Leningrad : "Nauka," Leniongradskoe otd-nie, 1983.240 p. : ill., maps ; 22 cm.Subjects: “...Lake ecology Latvia....”
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2Publicado 1988Leningrad : "Nauka," Leningradskoe otd-nie, 1988.311 p., [1] leaf of plates : ill. ; 22 cm.Subjects: “...Lake ecology Latvia Latgale....”
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3Publicado 1989Leningrad : "Nauka," Leningradskoe otd-nie, 1989.271 p. : ill. ; 23 cm.Subjects: “...Lake ecology Latvia Latgale....”
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4por Trifonova, Irina Sergeevna
Publicado 1990Leningrad : "Nauka," Leningradskoe otd-nie, 1990.182 p. : ill. ; 22 cm.Subjects: “...Freshwater phytoplankton Latvia Latgale....”