Collaborating Institutions Codes

AAS                American Antiquarian Society
AKM               Atwater Kent Museum
ATH                Athenaeum of Philadelphia
FLP                 Free Library of Philadelphia
HSP                 Historical Society of Pennsylvania
LOC                Library of Congress
LCP                 Library Company of Philadelphia
SI NMAH       Smithsonian Institution, National Museum of American History
                         Home & Community Life (H&CL)
                        Graphic Arts (GA)
                        Archives Center

The digital file names, including these codes, are often derived from the call number of the print assigned by the holding institution.