This is a 1951 book “The Aircraft Gas Turbine Engine And Its Operation” from Pratt & Whitney Aircraft Division of United Aircraft Corporation..........It has a small sticker tag scuff on the upper right front with a few other minor signs of wear here and there..............My pictures show only some examples it’s content............PLEASE ASK QUESTIONS BEFORE PURCHASE IF YOU HAVE ANY ADDITIONAL CONCERNS, OTHERWISE NOTE THAT THIS IS AN AS IS SALE WITH NO RETURNS.