The Holy Grail of all textbooks...the Teacher's Guide! This one pairs up with the 7th Edition of Edwin Stein's "Fundamentals of Mathematics", which can also be found in my store!
As Teacher's Guides are generally printed on softer materials, it's relatively common to find them in less-than-perfect condition. That's not the case here, though: while there is some light, noticeable wear to the cover, the inside pages are flawless. A great reference book!