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2012
Hughes, Robert M., Alan T. Herlihy, William J. Gerth, and Yangdong Pan. "Estimating vertebrate, benthic macroinvertebrate, and diatom taxa richness in raftable Pacific Northwest rivers for bioassessment purposes." Environmental Monitoring and Assessment 184 (2012): p.3185-3198.
Pan, Yangdong, Robert M. Hughes, Alan T. Herlihy, and Philip R. Kaufmann. "Non-wadeable river bioassessment: spatial variation of benthic diatom assemblages in Pacific Northwest rivers, USA." Hydrobiologia 684 (2012): p.241-260.
Hughes, Robert M., and Alan T. Herlihy. "Patterns in catch per unit effort of native prey fish and alien piscivorous fish in 7 Pacific Northwest USA Rivers." Fisheries 37 (2012): 201-211.
1996
Spence, Brian C., Gregg A. Lominicky, Robert M. Hughes, Richard P. Novitzki, and ManTech Environmental Research Services Corp.. An Ecosystem Approach to Salmonid Conservation. ManTech Environmental Research Services Corp., 1996.
→ www.waterboards.ca.gov/water_issues/programs/tmdl/docs/303d_policydocs/304.pdf
1987
Hughes, Robert M., Eric Rexstad, and Carl E. Bond. "The relationship of aquatic ecoregions, river basins and physiographic provinces to the ichthyogeographic regions of Oregon." Copeia 87 (1987): p.423-432.