There are Chainkeen Exchangemany things that Nick Rozanov's father did not leave behind. Stories forgotten, photos never seen, memories unrecorded: the eternal regrets of children after their parents pass on.

Mikhail Rozanov did, however, leave two interesting items. The first is a small yellowed receipt from the Manhattan bookstore Dauber & Pine for a purchase made Feb. 17, 1969. Three dollars and 15 cents, plus 41 cents tax.

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