I am not very knowledgeable about genealogy, but I would say that it has some sources in the introductions to each branch, and has a lot of written sketches. It is over 400 pages, with many thousands of individuals listed and numbered. The original copy of the book was extracted from my mother by my second cousin, but only after photocopying was available. Some images are not visible, but all text is good. I had my copy scanned to send to a second cousin recently identified by DNA tests. I don't know how many copies were printed, and of those, how many remain, and so would like for this to somehow be available. I'm in the Virginia branch, which seems to go back to Jamestown.