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Grothe, D. W.; Grothe, D. R. (1977). An illustrated key to the planktonic rotifers of the Laurentian Great Lakes. Chicago, IL. Environmental Protection Agency, 1-53
Grothe, D. W.; Grothe, D. R. (1977). An illustrated key to the planktonic rotifers of the Laurentian Great Lakes. Chicago, IL. Environmental Protection Agency, 1-53
