Logic
Free to read here, from Project Gutenberg.
A System of Logic, Ratiocinative and Inductive
The Advancement of Learning
A System of Logic, Ratiocinative and Inductive (Vol. 1 of 2)
The Logic of Hegel
The Essays of Arthur Schopenhauer; the Art of Controversy
The Categories
The principles of science
Wissenschaft der Logik — Band 1
The Game of Logic
Logic: Deductive and Inductive
A System of Logic: Ratiocinative and Inductive, 7th Edition, Vol. I
Euthydemus
Essays in Experimental Logic
The Art of Logical Thinking; Or, The Laws of Reasoning
A Class Room Logic
Studies and Exercises in Formal Logic
A System of Logic: Ratiocinative and Inductive, 7th Edition, Vol. II
Einführung in die moderne Logik. Erster Teil.
The Mathematical Analysis of Logic
Logic, Inductive and Deductive
A Logic of Facts; Or, Every-day Reasoning
The positive outcome of philosophy
Prolegomena to the Study of Hegel's Philosophy, and Especially of His Logic
Studies in Logical Theory
Wissenschaft der Logik — Band 2
Logic as the Science of the Pure Concept
Deductive Logic
John Dewey's logical theory
Reformed Logic
First notions of logic (preparatory to the study of geometry)
Logica
Ευθύδημος
Grundriß der Logik
The Essentials of Logic, Being Ten Lectures on Judgment and Inference
Lehre vom Schluss
Topik