G.E. Moore 
G.E. Moore [PDF ebook] 
Selected Writings

G.E. Moore, more than either Bertrand Russell or Ludwig Wittgenstein, was chiefly responsible for the rise of the analytic method in twentieth-century philosophy. This selection of his writings shows Moore at his very best.
The classic essays are crucial to major philosophical debates that still resonate today. Amongst those included are:
* A Defense of Common Sense
* Certainty
* Sense-Data
* External and Internal Relations
* Hume”s Theory Explained
* Is Existence a Predicate?
* Proof of an External World
In addition, this collection also contains the key early papers in which Moore signals his break with idealism, and three important previously unpublished papers from his later work which illustrate his relationship with Wittgenstein.