The site includes both world and US maps. US maps feature territorial expansion and slavery. Bibliographies List of resources on a certain topic. Bibliographies often cover a far greater time span than do indexes and therefore contain more items on a subject. Often bibliographies are selective and do not attempt to list everything on a topic, but chose materials according to certain criteria.
Annotated bibliographies are among the most valuable.
A collection of histories of varying length about the lives of individuals. In analyzing the causes and effects of an historical event, biographical works can provide factual information on individuals who played key roles in shaping an event's outcome. Biographies of historians often provide excellent sources for background useful in understanding their work. Chronologies List notable events during different time periods in a particular geographic area, or for a particular topic. Includes full text of documents.