On the Improvement of Understanding (Part of Unabridged Start Publishing LLC) Benedict de Spinoza eBook $0.99
An Enquiry Concerning Human Understanding (Part of Unabridged Start Publishing LLC) David Hume eBook $1.99
Collected Essays of Arthur Schopenhauer (Part of Unabridged Start Publishing LLC) Arthur Schopenhauer eBook $1.99
Tractatus Logico Philosophicus (Part of Unabridged Start Publishing LLC) Ludwig Wittenstein eBook $0.99