Letter from A to Dunn

Dunn receives a small letter from "A" on October 3, 1972. This correspondence is assumed to be from a close friend because Dunn did live in Marshall, Minnesota, but also the tone of the letter is one of an established friendship, based on sentence such as "[...] and do plan on staying over with us". There is no mention of his then-wife attending this dinner however. Noted on the back is a map for Dunn to follow