This vintage text is a stated Tenth Impression, September 1951. A hard cover book (no D/J) it is 527 pages in length and is filled with B&W illustrations that will be certain to thrill all collectors of this information. Our copy is in Fine condition with the only flaw being the former owners name neatly written in gold ink on the front cover. Kindly E-Mail us if you have any questions. Thank you.