A bibliography is a list of books. Most often it is a list of those books used as reference sources to support a scholarly work.
In this case, it is provided as a very limited, basic guide to sources that might be useful to the writer of historical fiction. I have divided this bibliography into ten sections:
Books That Tell You Where and How to Look
Books That List Reference Books
Maps and Atlases
Guides to Periodical Literature
Series Books on History
Books on How People Lived