The science of logic; or, An analysis of the laws of thought.

Mode of access: Internet.

The logic of science,

Mode of access: Internet.

Elements of logic, together with an introductory view of philosophy in general, and a preliminary view of the reason. By Henry P. Tappan.

Mode of access: Internet.

Logic,

Mode of access: Internet.

The origin and growth of Plato's logic; with an account of Plato's style and of the chronology of his writings,

Mode of access: Internet.

The elements of inductive logic.

Mode of access: Internet.