Greenlawn Cemetery has been a tremendous help to me in looking for relatives buried there. They have a "Genealogy Request for Information" form which tells you what they need to know, how to fill out the request form, and what is the cost. I find their costs VERY reasonable. I think the best thing to do is write to them requesting the Genealogy Request for Information form and anything else you should know. Their address is:
Green Lawn Cemetery
Attn: Genealogy
1000 Greenlawn Avenue
Columbus Ohio 43223-0068
Telephone (614) 444 - 1123.

Hope this helps.

CB Holland