Here we have the solution key to Harper and Row Geometry, copyright 1986. It was written by Max A. Sobel, Evan M. Maletsky, Brother Neal Golden, S.C., Norbert Lerner (what a nerd!), and Louis S. Cohen.
The top of the cover has some brown spots of unknown origin, and there is some slight wear throughout. The inside, however, is pristine, with some slight yellowing being the only concern...there are no marks, tears, or any other imperfections evident.