The largest percentage of data in Father Morrow's Collection are the many photographs of buildings which he has collected. These have been acquired from a variety of sources, including images which are in other GRPL archival collections. This duplication within collections may come from the Morrow image originating in a GRPL collection, or from Father Morrow's work to acquire images from new lenders, which were added to the GRPL archival collections as well as his own, both before or since he gave this collection to the Library.