The people in the office at Beth David have always been very nice to me. In some cemeteries the staff becomes hostile when you ask for a list of different grave locations and tell you you should have written in advance. (Invariably these same people don't reply when you actually do write in advance.) At Beth David, this has never been a problem, although that might change if the list was too long.  One nice thing about their system is that they give you a printout that can fit up to four locations on the same map and prints a letter corresponding to the person's name, on the map, in the approximately location of the grave, relative to the block they are in. This enables you to map out the most efficient path to do your work without running back and forth across a large cemetery.
--
Peter Cohen
California