Hello, The APSRS CDs released in the mid-1990s contain an database used to list all the federal-level aerial photo missions covering any given 7.5 minute quadrangle area. To use, one must install a front-end software app for querying the underlying database. The software is 16-bit and thus cannot be installed on modern 64-bit computers. Meanwhile, the underlying database appears to be in a proprietary binary format that can't be easily opened and read. I am thus wondering if anyone knows of a continuity plan to update the software and/or the database? Or is there an alternative means for accessing the data, perhaps something online? Using EarthExplorer, this can be done in a round-about way, but you have to select each agency one at a time to see what may possibly be available. By the way, APSRS (not to be confused with ASPRS) stands for Aerial Photography Summary Record System. I appreciate your thoughts and ideas! Jeff Essic ------------------------------------------------------------------------------------ Jeff Essic Data Services Librarian North Carolina State University D.H. Hill Library, Research Engagement Department Box 7111, Raleigh, NC 27695-7111 (919) 515-5698 http://www.lib.ncsu.edu/gis