These next three books are not really ghostly. But they are a great read!

"The Legend of Dudleytown" is written by Gary P. Dudley. He is a direct descendant and he addresses the lore and legends of this deserted village in Connecticut, debunking them.
"Mothman and Other Curious Encounters" by Loren Coleman. Mr. Coleman is the leading cryptologist of our time. He also writes about such entities as Lizardmen, Thunderbirds and the work of John Keel, the classic writer on the unexplained.
"Weird Ohio" is a book just for fun. It's written by James Willis, Andrew Henderson & Loren Coleman through an association with Mark Sceurman and Mark Moran. The latter two have published Weird New Jersey magazine for years. It talks about the strange legends and stories of our state.