Wear to cover, ink signature first page, otherwise like new- clean with tight binding.    A really nice approach to getting up-to-speed on an opening !   As you can see from the two additional pics,  Horowitz has approached them from several different angles--an introduction to its strategy,  a table of lines to show key ideas (with analysis as footnotes),  a list of lines which are practical, sometimes some plausable alternatives, and a few full games (even if uncommented).    There are some fragments, but most analysis is unattributed (author's?).    English descriptive notation.   Index of opening names.   790 large pages.