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Keywords from Image Description:
Potamogeton crispus . en Potamogeton crispus germinating burs October nl Gekroesd fonteinkruid Cite book Potamogetons in Relation to Pond Culture Moore Emmeline Washington DC Government Printing Office Plate XXXIV Creator Emmeline Moore PDUWASHFMIB Institution University of Washington FMIBsource accession number Potamogeton crispus