An unpublished photo, credited to staff photographer David MacDonald, shows members of Gorham High School's Gay-Straight Alliance marching up Congress Street in downtown Portland in the annual Portland Gay Pride Parade on Saturday, June 17, 2000.

A previously unpublished photo, credited to staff photographer David MacDonald, shows members of Gorham High School’s Gay-Straight Alliance marching up Congress Street in downtown Portland in the annual Portland Gay Pride Parade on Saturday, June 17, 2000.

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The Portland Room of the Portland Public Library is in the process of organizing and conserving the archival collection of original Portland Press Herald, Maine Sunday Telegram and Evening Express photographic negatives — a major collection that spans from 1937 to 2005. Find more photos at www.pressherald.com/flashback/.