Research bibliography: a union list of publications from Michigan's mineral springs, mineral wells, and mineral baths.

Although no more than a few dozen mineral wells and springs existed in Michigan at any one time, since their discovery over 125 years ago nearly two hundred firms have operated watering places for the suffering in this state. The publications produced by this industry were collectively quite numerous, but scarcely a hundred or so examples of this genre can be located today. On those rare occasions when materials of this nature can be found in out-of-print book stores or antiquarian dealers'catalogs, it is not uncommon for the asking price to approach $100 per piece. Now that this union list has revealed how scarce and valuable these publication are, persons and institutions possessing such items should take precautions to ensure the security of their holdings.