Georgia Hardemans

I am looking for anyone with info on (COL) John L(umsden) Hardeman who was Solicitor General (DA) of Bibb County,Ga. He retired in 1919 and was planning to wrte a book on the Lumsden family. As with most plans of men and mice something intervened. He died less than a month after retiring. The database he had was passednto a cousin Mary Lumsden Kendall. It was there in 1925. Later was in the possession of his son Thomas of Thomasville. Any help greatly appreciated.