The aerial images in this collection are held by the Mansfield Library's Archives and Special Collections (ASC) in its United States Forest Service Northern Region Aerial Photographs Collection (Mss 860). The original images are in negative format. To date, approximately 4,000 of the 50,000+ images in the collection have been scanned for online access. An index map to scanned and not-yet-scanned images is available on the Archives' Aerial Photography webpage.