SPRINGVALE — Harland Eastman removes the lid of the solid cardboard box on the table before him and starts looking through the envelopes packed neatly and single-file inside. He pulls one of the envelopes free from the pack and sets it on the table. The envelope has a date written on the front: May 30, 1987. Eastman, the president of the Sanford-Springvale Historical Society, opens the envelope and removes a stack of black and white photos. Some of these photos from that spring 32 years ago show snapshots of the Annual Town Meeting in Sanford.