Barbara Clark will present her slide show on the use of D2 for cleaning graves. D2 is a non-toxic biological, that kills and deters biological growth on many grave marker materials. Barbara Clark is a Registered Professional Archaeologist who specializes in historic archaeology, of the 19th and early 20th centuries. She is also the regional director for the North-Central Florida Office of the Florida Public Archaeology Network. The meeting will be held in Program Room A of the downtown public library, 200 W. Park Ave. Sharing time is at 1:30pm and the meeting starts at 2pm.