That resident revenant of so many publishing houses prowls through some of our statelier homes in Washington and Virginia using some of his older material (Ghosts I've Met -- Bobbs-Merrill) and sometimes collaborating with Sybil Leek. Ghosts ""carry forward into the present some important unresolved problems of the recent past,"" so Nixon apparently shouldn't worry too much whether he's alive or dead . . . All kinds of people are talking to the Kennedys, and it's nice to know that John F. bears no ""hard feelings"" toward Oswald up there. Both Wilson and Lincoln are very perturbed about present conditions and there are voices and footfalls all over. Since Holzer concludes that this spirit world reflects the real one -- ""a hopelessly mixed-up hodgepodge of truth, half-truths and wishful thinking"" -- one is apt to find this less than phantastic.