Files contained in this subdirectory Files are georeferenced to NAD27 UTM13N final_flight_lines.dxf flight lines with numbers file is in autocad format geology_hem.ecw geologic map for study area (figure 4 report) file is in ERMAPPER compressed image format geology_hem.ers header for ERMAPPER file hem_survey_quads.ecw digital raster graphics topographic maps for study area file is in ERMAPPER compressed image format hem_survey_quads.ers header for ERMAPPER file survey_area_boxes.dxf bounding box for airborne survey area and detail areas file is in autocad format