I have over here in my file cabinet a file called "Poems: Feedback from Readers," where I keep all the physical copies of all the poems that have come back from the people I've shown them to, which I use a lot in revising.
That's a letter from Phil Levine. He wrote me because I wrote him. And I've got a file in there, probably 1.5-inch thick, of letters from Phil Levine. That's almost all letters.