Hardcover. NY, Random House, reprint, Book: Very Good, Dust Jacket: None, Hardcover, the philosopher's most important works, unabridged. Bright tight, clean copy in light beige cloth covers with brown and gilt design on spine. 6-1/2 x 9-1/4, xxxix + 1487 page, b/w frontispiece, bibliography. In a blue cardboard slipcase with a beige label. Appears unread.

Softcover. Oxford, UK, Clarendon Press, Reprint, 1978, Book: Very Good, Dust Jacket: None, 306 pages. Softcover with light wear to wraps. Sunfade to spine. Spine faded. Small black mark on rear wrap, some lines highlighted on four pages. Light toning throughout, illustrated by tables & figures in bw.