Alabama Archives, Historical & Genealogical Societies
It is a good idea to familiarize personally with just about any repository in Alabama that you simply might travel to by communicating with to the best suited archive or library in advance.
Most, if not all, Alabama repositories have written and published content that present its collections as well as research policy.
Alabama archives and historical organizations usually have websites that provide similar details. Several also contain downloadable data for some or parts of their collections.