In addition to Mr Fronzeck's excellent advice, please note that you have posted on the Cuyahoga County, OH Genforum and Cincinnati is on the opposite end of the state at the southern state line.I suggest you contact one of these locations of the hospital to find out which might have the info or be able to direct you to the government office that would have the info on the birth mother.You might have a serious problem with privacy considerations.
Christ Hospital (513) 232-7854 6562 Salem Rd Cincinnati, OH
You can also try contacting any of the Cincinnati newspapers for birth listings for the first week of May 1967.They might have your birth listing from before the adoption killed the information on your birth parents.Below are a couple of them.
Cincinnati Post (513) 352-2000 125 E Court St # 500 Cincinnati, OH
Cincinnati Enquirer Inc (513) 721-2700 312 Elm St Cincinnati, OH