Donald if you check my "Davis/Moskal Bryant/Cordle Hagler/Davis Family Tree" you will find that the tree for Hagler is taken from the book that was put out by Gordon Hubbard with the assistance of LaJoie Roberts. This Hagler book was just distributed to the Hagler line that (I am supposing) reguested one. I am going to get copies made of it for my children in the near future. I will have one made for you if you like. Can't say it will be in the next monthor two though. It was printed in 1981, so most of the research was accomplished by good old hard work research, not like we are now pecking away on this computer keyboard.
I have the copy my Grandmother Cullie Davis had. Hope this helps.