Book to consider for your personal genealogy reference library: Courthouse Research for Family Historians: Your Guide to Genealogical Treasures by Christine Rose.
A "Source" can be a book, record, object, or person supplying information.
A Gazetteer is a geographical dictionary.
Early roadways were established following Indian paths or trade routes.
The 1890 census was destroyed but many groups are now gathering other data to fill in this gap