1977 - On the Nature of the Universe (Paperback) → Paperback, Hardcover ISBN-13: 9780140440188 ISBN-10: 0140440186 Genres: Literature & Fiction, Nonfiction 1 1965 - On the Nature of the Universe (Paperback) → Paperback, Hardcover ISBN-13: 9780804464444 ISBN-10: 0804464448 Genres: Literature & Fiction, Nonfiction ? |