From:  blog.familytreemagazine.com/insider/2010...

Use link to read the entire article :)

The probate court  for Hamilton County, Ohio—location of our hometown of Cincinnati—launched an Archived Record Search for records from 1791 to 1994.

It's not a database search where you type in a name. Instead, you open image files (PDFs or TIFs) of index books and/or record books for records including:

• Estates, 1791 to 1984

• Wills, 1791 to 1973

• Trusts, 1791 to 1984

• Guardianships, 1791 to 1984

• Marriages, 1808 to 1983 

• Minister's Licenses, 1963 to 1975 (index books only)
  

• Birth Records, 1863 to 1908

• Birth Registrations and Corrections, 1941 to 1994

• Death Records, 1881 to 1908

• Naturalizations, 1856 to 1906 (index books only; you can request photocopies from surviving record books from the court, or rent Family History Library microfilm through a Family History Center)

• Probate Court Journal Entries, 1791 to 1837 (no index; you must browse by volume and page number)
  

• Physician Certificates, 1919 to 1987 (no index; you must browse by volume and page number)