Nemadji state forest trail maps

I’m headed up to Nemadji state forest in a couple weeks with 3 other couples. I was up there last year for the first time and enjoyed it but never got to the north east corner which I have heard are very good. The only maps I have are from

http://www.straightarrows.org/wp-con…adji-Map_b.pdf

And here

Map with driving directions to Nemadji State Forest in Minnesota

We will be parking at the northern most staging area. On my maps it shows a lot of OHM trails in the north east corner. Are there more atv trails than what is shown? Where can I find better maps?
Thanks