A Birder's Guide to North Dakota

An interesting little book, all about what birds you can find on a birding trip to ND. It's outdated, being from ‘79, but quite interesting—though landmarks have likely changed, there's a pretty good chance the birding is similar. It would probably be especially useful to the dedicated birder or to local residents. It's written in an easy narrative style, with tips on weather and flora/fauna as well, and contains an index for easy identification by region.
Available free on Project Gutenburg.