Historical Books available free online:

The Art of Fencing by Monsieur L'Abbat

How to Fence by Frank Tousey

Other Possible Reading:

Fencing: The Modern International Style by Istvan Lukovich

Fencing and the Master by Laszlo Szabo

On Fencing by Aldo Nadi

Epee 2.0: The Birth of the New Fencing Paradigm by Johan Harmenberg

Epee 2.5: The New Paradigm Revised and Augmented by Johan Harmenberg