I do not have the book on the descendants of James and Agnes. What I do have is Adams info from a book published by the Historic Genealogical Society of Marion County AR. I know the people who put this together relied heavily on the the 1978 book. However they don't actually site sources.
Here is what I have. James Adams (son of James and Agnes) married Phoebe Davis. They had eleven children including George. My info states George Adams born Christian County KY 17 May 1807 died AR 28 Oct 1854 and is buried Adams cemetery. Married in Ky 5 Aug 1830 to Mariah Louisa Lynn. Marian was the daughter of Pitts and Mary Catherine "Mauldin" Lynn who was born Logan County KY 15 Sep 1815. She died Greasy Creek 23 Jan 1883 and is buried n the Adams cemetery. Children listed are Lynn born 1831, Maria (probably a typo and should be Mariah)Louisa born 1833 and married Samuel Lee 25 Dec 1858, Thena Catherine, Isaac Davis, Hannah Elizabeth, Arvilla Angelina, Phoebe, James Weber, George, Mary, Thomas.
I hope this helps clear things up for you.
There is more info but too much to type in. Can snail mail a couple of pages if you want birth dates on everyone, ect.