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      <marc:subfield code="a">Ecological studies of the aquatic invertebrates of the Alberta Oil Sands Environmental Research Program study area of northeastern Alberta / </marc:subfield>
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      <marc:subfield code="a">"Invertebrate fauna of the Athabasca River and its tributaries, the Muskeg and Steepbank rivers, are described qualitatively and quantitatively from baseline information gathered during 1976 and 1977. Investigations were also conducted into responses of macrobenthic communities to several potential environmental disturbances which might result from oil sands development"--Abstract.</marc:subfield>
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