Omar Pound and Walter Litz edited the early letters of EP/DShakspear in 1984. I guess this is an extension of the 1909-1914 set.  I hope that the new edition includes the Shakspear letters. For those who need the info on those early ones:
 
Ezra Pound and Dorothy Shakspear, Their Letters 1909-1914
New York: New Directions 1984
 
it is a great set--shows Pound as Catullus wannabe, and as a poet who lives in the sun, not in the scriptorium.  He worked till noon, then headed out the door.