Vintage, DEC PDP 11 / 04  User systems manual, about 1/2 inch thick..  In good shape, Does have tape on the front were there was a tear... from the late 1970's...

Disclaimer: All my parts I sell and retest are intended to be used in the collecting parts, hobbies building stuff, robotics, school, music audio, and college projects, etc, " Not to be used or not intended for use in life support systems or in space flight systems, or aircraft flight systems, or under water subs or military systems" When you buy these parts you are responsible for there use YOU the buyer. I try to test and sell the best semiconductors on Ebay, I am the only person that professionally retest some parts on Ebay to a factory spec that I know of, if I do not retest the parts they are sold as good New Old Stock.