Triumph of the moon
Another stalwart. Another one getting on in years, but still if not unique, then groundbreaking at the time.
Hutton's research is sound and well supported (as one would expect). He makes his own views known about some still controversial subjects (Leland, Old Dorothy, etc.) but his views are supported by the evidence (which is refreshing, if nothing else, considering other things written in this area).
Basic background reading.