TLS, one page, 6 x 9, Research and Engineering Consultants, Inc. letterhead, May 12, 1976. Aldrin politely declines an invitation. In part, ?I am very sorry that I will not be able to make the Father-Son night on June 29, 1976. My schedule is just too tight to fit another evening in to it.? In fine condition, with a bit of mild toning to horizontal mailing folds. COA Scott Cornish and R&R COA.