If you are thinking of looking for ancestral gravestones in Massachusetts, David Lambert's Guide to Mass. Cemeteries is a must! This is the 2nd edition which was just published. I had the first edition on my shelf for years. Each cemetery is given with contact information, so you can google map yourself directions and off you go. The guide also tells you if the records of the cemetery are in print or on the Internet. It really is invaluable.