A comprehensive introduction to the bosonic string. The cover has some scratches and signs of aging, and some stains. I haven't found any writing inside, but as I am a non-professional, I may have missed something. Please understand that this is a used item before purchasing. It has been stored at home. [Title] String Theory I, An introduction to the Bosonic String [Author] Joseph Polchinski [Publisher] Cambridge University Press [Published] First edition 1998, paperback edition 2005 Thank you.