I would like to see FL publish the book. Here is a description of the book from Reformation Heritage Books:
"No book had more influence in confirming a Sabbatarian “heart” to Puritanism than that of the parson of St. Andrews, Norton, Suffolk, Nicholas Bownd. The True Doctrine of the Sabbath was the first scholarly treatment defending the concept of the Christian Sabbath or Lord’s Day, later embodied in the Westminster Standards. Not reprinted since 1606, this influential work is presented afresh in a new critical edition."
He has been said to be influenced from his stepfather Richard Greenham. The book is derived from his sermons preached around 1586. You may get the sample pages of the book here.