For your consideration, here is the Twelve Concert Duets For Cornet or Trumpet Song Book, in the Rubank Eductional Library, no. 197, by J.S. Cox, copyright 1958, published by Hal Leonard, no. HL04470790.  It has a little wear on the covers.  There is a marked out label on the front cover and a marked out UPC code on the back cover.  It will be mailed in a box for protection.  Item pictured is the actual item up for sale and comes from a non-smoking household.  (615.236-1.4hc)