Some great visual history of Mercer County farmsteads is available through an on-line database. It’s called Vintage Aerial and is the idea of Tom Wolff. You can visit the site at www.vintageaerial.com.There are 26-million farmstead photos in the library from 41 different states. A Mercer County search includes 7,884 photographs on 219 rolls of film. Again, the site is “vintageaerial.com”.