Information for the Genealogical Societies in Southwest Ohio. Some of these have more info than others but most also have publications that they sell, and these can be very helpful if you have a few people you are looking for.
Brown County Chapter, OGS
PO Box 83
Georgetown, OH 45121-0083
Brown County Chapter, OGS meets at the Old County Jail, Apple and Cherry Streets, Georgetown, OH on the third Thursday of each month at 8:00pm.
Miami Valley Genealogical Index:
Surname index of census, tax, marriage & wills records for these counties: Butler, Champaign, Clark, Darke, Greene, Hamilton, Mercer, Miami, Montgomery, Preble, Shelby, Warren. http://www.pcdl.lib.oh.us/miami/miami.htm
Midwest OHio GENealogy on the WEB Network
Miami Valley, Ohio counties included in Region 7 of the Local Government Records project: Auglaize, Champaign, Clark, Darke, Greene, Logan, Mercer, Miami, Montgomery, Preble, Shelby. http://ohgenweb.net/