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Gordon J. Hopkins

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Phytoplankton methods manual with special emphasis on waterworks operation
The zebra mussel, Dreissena polymorpha--a photographic guide to the identification of microscopic veligers
zebra mussel, dreissena polymorpha: a photographic guide to the identification of microscopic veligers
Phytoplankton methods manual with special emphasis on waterworks operation: internal methods manual : report
zebra mussel, Dreissena polymorpha--a photographic guide to the identification of microscopic veligers
Phytoplankton Methods Manual with Special Emphasis on Waterworks Operation : Internal Methods Manual : Report