Encounter in a Small Old Cemetery

A 300-line poem about a man who decides to visit such a graveyard in October near midnight, in hopes of seeing a ghost. He stumbles across the field as a storm approaches.
I've got to tell you that he sees only parts of what might be a ghost - not a very satisfying result, and then retreats to his car.
That's all.
Yet this is one of the finest and most affecting modern poems for reading out loud. It will haunt you.