Nature & Ecology

NOAA technical report NMFS SSRF
United States National Marine Fisheries Service, United States National Oceanic and Atmospheric Administration
Freshwater planarians (Turbellaria) of North America
Oceanography and Limnology Program (Smithsonian Institution), Roman Kenk, United States Environmental Protection Agency
Geographic variation among brown and grizzly bears (Ursus arctos) in North America
E. Raymond Hall, University of Kansas Museum of Natural History
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