A useful link if you are researching in the Butler County, Ohio area. This is part of the USGenWeb project. Members can download this digital book from Shared Ancestors in the Downloads section!
Introduction on the site – “This index was created in an effort to fill a void in the genealogical research for Butler County, Ohio. The volume was not indexed with the original publication because, in the editors’ words, “Biographies and Portraits are arranged in alphabetical order, making an index unnecessary.” This is obviously not the case since there about 600 surnames as the subjects of the biographies, but over 3,000 total surnames in 9000 entries among the pages. I hope that this helps you find your relatives. Many of the biographies include photos or drawings of the subjects, and these are noted in the index. However, the book has not numbered the pages of these illustrations, so this index uses the text page number facing the illustration as its page number. ”
Gary S. King