http://www.usgs.gov/pubprod/maps.html

This is the homepage for the United States Geological Survey Map Section. There are several maps that you can download or order in paper form or in digital form. Hope this helps. Also, I don't know if there is any blm land in the area, but they have their own set of maps that show property ownership. These maps are also produced by the USGS. I would also contact the NWR that you plan to hunt and see if they have maps that would be of use to you. Hope this helps.