There is also a wealth of historical information from the various amici briefs on the
D.C. v Heller case at the Supreme Court. The Case Filings are
here.
Particular attention should be paid to:
Cato Institute/Joyce Lee Malcolm [The Right Inherited from England]
Second Amendment Foundation
Academics for the Second Amendment [Ratification and Original Public Meaning]
Heartland Institute, Prof. Volokh
just to name 4 of the 47 amici for
Heller.