Nothing shows up in the book. However, in Brentwood on Long Island is Pilgrim Psychiatric Center. I assume this is the place you are looking for? Here is a link to their sit:http://www.omh.state.ny.us/omhweb/facilities/pgpc/facility.h...
It does say there is a cemetery there...You could try giving them a call.
That's all I can really come up with. Good luck.