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1996. Federal Emergency Management Agency. Q3 flood data for Oregon, 1996. The Q3 Flood Data are derived from the Flood Insurance Rate Maps (FIRMs) published by the Federal Emergency Managem... Federal Emergency Management Agency.
2010. U.S. Census Bureau. Geography Division. This polygon data layer represents the 2010 TIGER/Line voting districts for Multnomah County, Oregon. The TIGER/Line Files are shapefiles and relat...