Sure, dmb291975, scope the backroads for good, private ground, channel your inner shroomer self, and ASK.
I generally offer to share with the landowner ("if I find any"). They're usually down with it. In fact, I left a bag of 35 or so on the doorknob of a farmer today. I've been shrroming there for over 20 years. They really appreciate it because they're too busy with spring planting to get out. Once you've established a positive relationship you'll be in like flint next year.
BTW, I was down in Jefferson, Wapello and Keosaqua Counties yesterday and almost got skunked. Things are awfully dry and the 40 I found were mostly stressed. Half-dried or (worse) crumbly. It's about over down there unless you're in deep ravines on the north/northeast slopes. Years ago I had good luck in Lake Darling SP in deep ravines during late season.
Go north, and go get 'em!