There are quite a few free Alabama histories and related historical material for Alabama on the internet.
Alabama, Her History, Resources, War Records, and Public Men: from 1540 to 1872, by Willis Brewer, 1872 (Pickens County starts on book page number 499) at Google Books
A Bibliography of Alabama by Thomas McAdory Owen, 1898 at Google Books
The History of Alabama and Dictionary of Alabama Biography in Four Volumes, Volume III, published 1921 at Alabama Department of Archives and History (ADAH)
The History of Alabama and Dictionary of Alabama Biography in Four Volumes, Volume IV, published 1921 at HathiTrust (all four volumes are at HathiTrust)
Publication of the Alabama State Department of Archives and History, Historical and Patriotic Series, No. 6: The Formative Period in Alabama, 1815-1828 by Thomas Perkins Abernethy, Ph.D., 1922, at Google Books
Tennessee-Tombigbee Waterway, Alabama and Mississippi Navigation at Google Books