Great vintage engineering textbook “Signals in Linear Circuits” by Jose B Cruz and ME Van Valkenburg 1974z Very good condition with only a few cosmetic flaws; a few minor stains on covers, a dedication from former owner in front cover, and notes taken in a small handful of pages <20, though almost all in pencil Please investigate all photos for your own assessment over possible tiny flaws inherent to vintage pieces; vintage pieces sold as is. Thank you!