Primary means written at or near the time of the historical event.
Secondary means written many years later, probably by a scholar researching the historical event.
Contains full runs of 48 newspapers specially selected by the British Library to best represent nineteenth century Britain.
Avalon Project Documents in Law, History and Diplomacy
Eurodocs History of the United Kingdom - Primary Documents
Internet Modern History Sourcebook
A repository for digital collections. Items in the public domain (works published before 1923) are freely accessible online.

A digital library of Internet sites and other cultural artifacts in digital form. Includes digitized books, periodicals, media, and more.