Here is another entry for you - note that both names, Allen D. and A.D. are used here.This is from a Gahagen file online:
Deeds of Gahagan in Catahoula Parish: Catahoula Parish Conveyance Book H p 54: 1846 21 Jan. Allen D Ratliff of Catahoula to Lawrence Gahagan of some 309.82 acres in se quarter of Sec 10 and sw quarter of Sec. 11 in Township 10 of Range 4E. Also 1 other tract on Oauchita River at mouth of Bayou Dan 50.10 acres being Lot #3 of Sect 23 in Twp 11 of Range 5E. in conderation of 36 bales of merchantable cotton to be delievered on the Bayou Dan Landing as follows: 12 bales on Jan 1, 1847 12 bales on Jan 1, 1848 12 bales on Jan 1 1849 the land to be mortgaged for payment as above. signed A.D.Ratcliff Lawrence Gahagan wit: John G. Alexander George L Sawyer? Judge James Taliaferro 1860 Concordia census has A.D.Ratcliff 55 farmer 80,000 500 N.C. 7th Ward not too far from R.M.Ferguson 48 overseer from Ga.