Hi Frank. I would say that Karel Whyte's book is probably the most relevant to your Swearingen lines. Although the H. H. Swearingen books (1884, 1894) are historically interesting, everything in them and much more are contained in Whyte's book. The Lola Thoroughman book is not worth persuing as it is so bad. The others probably have little on your line that is not covered in Whyte. I am a Stull, not a Swearingen descendant, thus my only interest in Swearingens are those who descend from Catherine Stull who married John Swearingen and Susanna Stull who married Charles Swearingen, son of Van Swearingen & Elizabeth Walker. Hence my own book carries only the descendants of those two lines and would not cover any of your lines. Good luck.