1930s_airphotos_77	1930's Digital Georectified Image of Polk County, Iowa, in MrSid Format
	1950s_airphotos_77	1950's Digital Orthorectified Image of Polk County, Iowa, in MrSid Format
	1960s_airphotos_77	1960's Digital Orthorectified Image of Polk County, Iowa, in MrSid Format
	1970s_airphotos_77	1970's Digital Orthorectified Image of Polk County Iowa
	1980s_CIR_airphotos_77	1980's Digital Orthorectified Image of Polk County, Iowa, in MrSid Format
	1990s_airphotos_77	1990's Airphoto Mosaic for Polk County
	2002_CIR_77	2002 Color-Infra-Red Airphoto Mosaic for Polk County
	2004_NAIP_airphotos_77	2004 National Agriculture Imagery Program (NAIP) Aerial Photography for Polk County, Iowa
	2005_NAIP_airphotos_77	2005 National Agriculture Imagery Program (NAIP) Aerial Photography for Polk County, Iowa
	2006_NAIP_airphotos_77	2006 National Agriculture Imagery Program (NAIP) Aerial Photography of Polk County, Iowa
	2007_NAIP_airphotos_77	2007 National Agriculture Imagery Program (NAIP) Aerial Photography of Polk County, Iowa
	2008_NAIP_airphotos_77	2008 National Agriculture Imagery Program (NAIP) Aerial Photography Mosaic of Polk County, Iowa
	2009_CIR_airphotos_77	2009 Two Foot Pixel, Color Infrared Orthophotography Mosaic of Polk County Iowa
	2009_color_airphotos_77	2009 Two Foot Pixel, Color Orthophotography Mosaic of Polk County Iowa
	2009_NAIP_airphotos_77	2009 National Agriculture Imagery Program (NAIP) Aerial Photography Mosaic of Polk County, Iowa
	2010_NAIP_airphotos_77	2010 National Agriculture Imagery Program (NAIP) Aerial Photography Mosaic of Polk County, Iowa
	2011_NAIP_airphotos_77	2011 National Agriculture Imagery Program (NAIP) Four-Band Aerial Photography of Polk County Iowa
	andreas_atlas_77	Georectified Image of Polk County from the Illustrated Historical Atlas of the State of Iowa, 1875, by A.T. Andreas
	census_1990_77	US Bureau of the Census, 1990 STF3a block level for Pocahontas County, Iowa
	census_2000_blocks_77	Polk County Census 2000 Blocks
	common_land_unit_77	Common Land Unit for Polk County, Iowa
	contours_2ft_77	Generalized Two Foot Contours of Polk County Iowa Derived from Lidar Data
	DEM_3M_I_77	Three Meter Digital Elevation Model of Polk County Iowa as an Imagine 16-bit Integer Raster
	DOT_roadmap_77	Iowa DOT Polk County Highway Transportation Map, 2005
	drainage_districts_77	Drainage District Boundaries of Polk County Iowa
	FEMA_DFIRM_West_DM_77	Digital Flood Insurance Rate Map Database of the City of West DesMoines, Polk County Iowa
	FEMA_floodplains_77	Q3 Flood data for Polk County produced by FEMA
	GLO_maps_77	General Land Office (GLO) Maps of the State of Iowa, as Surveyed from 1836-59, Polk County
	GLO_vegetation_77	Government Land Office Vegetation 1832-1859 for Polk County, Iowa
	Hillshade_1M_77	Hillshade of Polk County Iowa Derived from the LiDAR One Meter Digital Elevation Model
	HRLC_2009_77	High Resolution Landcover of Polk County Iowa, 2009
	NWI_77_line	National Wetlands Inventory data for Polk County, Iowa
	NWI_77_poly	National Wetlands Inventory data for Polk County, Iowa
	NWI_remap_line_77	National Wetland Inventory Remap and Update, Line Features, of Polk County, Iowa
	NWI_remap_poly_77	National Wetland Inventory Remap and Update, Polygon Features, of Polk County, Iowa
	PLSS_77	Public Land Survey System for Polk County, Iowa
	PLSS_QQQ_77	Public Land Survey System, Quarter-Quarter-Quarter Sections, of Polk County Iowa
	rivers_77	Rivers of Polk County
	roads_2006_77	Road Centerlines of Polk County, Iowa, 2006, from Iowa DOT GIMS files
	spot_77	Digital spot data for Polk County, Iowa
	ssurgo_line_77	Soil Survey Geographic (SSURGO) Database for Polk County, Iowa
	ssurgo_soil_77	Soil Survey Geographic (SSURGO) Database for Polk County, Iowa
	ssurgo_spot_77	Soil Survey Geographic (SSURGO) Database for Polk County, Iowa
	surficial_geology_77	Surficial Geology of Polk County Iowa
	USGS_quads_77	USGS 7.5' Quad Mosaic for Polk County