?Reliable Taxonomic keys to Species Level?

Fish4va	March 31st, 2008, 11:43 am
lansdale, PA Posts: 1	I am looking for reliable keys, preferably published books or articles, that can be used to identify aquatic inverts to species level. I am currently using such sources as Pennak, Wiggins and Merritt & Cummins for both work and play. These sources are great at getting to genus level identification. Does anyone have any suggestions?

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