Certain Shell Heaps Of The St. John's River, Florida: Hitherto Unexplored is a book written by Clarence Bloomfield Moore in 1894. The book is a detailed exploration of the shell heaps found along the St. John's River in Florida. These shell heaps are mounds of shells and other debris left behind by Native American tribes who lived in the area thousands of years ago. Moore's book is based on his own personal exploration of the area and includes detailed...