This is a very detailed and thorough field guide for all levels of damselfly enthusiast. There are literally dozens of illustrations of abdominal appendages and abdominal markings covering all of the relevant species. Extraordinary photographs, mostly by Mike Reese, show most (all?) of the different morphs.
Introductory chapters cover all aspects of damselfly life history. Well written.
Pocket sized and very portable.
Covers N Minnesota, N Wisconsin, the UP and N michigan and most of the wooded portions of Ontario. Covers many of the species east into New England.