This data set depicts the natural areas in Illinois, digitized
from USGS 7.5 minute quadrangles or from aerial photographs at
a scale of 1:8,000. Boundaries are approximate and do not
indicate ownership ...
Appropriate for use in local and regional thematic analysis.
Data are not accurate enough to be used as a geodetic or
engineering base. Intended to include representation for
each Conservation Area. ...
This data set shows state Fish and Wildlife Areas. Digitized from maps provided
by DNR, county plat books, USGS TIGER files, and 1:24,000 quadrangle maps.
Boundaries are approximate and do not indicate ...
This data set shows state forests in Illinois. Digitized from maps in county
plat books or from 1:24K quadrangle maps. Boundaries are approximate and do not
indicate ownership or property boundaries. ...