In 2 vols.
Originally published in one vol. as 'Fortschritte und Rückshritte der Philosophie'. Frankfurt am Main: Verlag Offentliches Leben, 1962.
Progress and regress in philosophy : from Hume and Kant to Hegel and Fries by Leonard Nelson. ISBN 0631138501. Published by Blackwell in 1971. Publication and catalogue information, links to buy online and reader comments.