1987, first edition. Revised for Version 2.6. A copy that has been read, but remains in reasonably good condition. All pages are intact and the cover is intact. The spine and cover and edges may show signs of wear from handling or reading and there may be slight discoloration due to age. Packaged with care and shipped with delivery confirmation. if you are not satisfied with the condition of the book, please return the item for a refund.