One of my 'finds' during my recent IGHR Law Libraries adventure courtesy of the Georgia Genealogical Society is The Sourcebook to Public Record Information: The Comprehensive Guide to County, State, and Federal Public Record Sources 8th Edition by Sankey. At over 1800 pages, it is a contemporary reference that no other genealogy related book I've run across can match. I got my copy for less than $9 and that included postage. I saw a used copy today for $1.99