The H. Furlong Baldwin Library of the MdHS makes available to the public some of the nation’s most extensive and important historical resources. Among the 7,000,000 items in the library’s collections are Francis Scott Key’s original manuscript of "The Star-Spangled Banner," papers of Maryland’s colonial governors and signers of the Declaration of Independence; over 700,000 photographs, and extensive genealogical resources. The library maintains an extraordinary collection of books, journals, manuscripts, newspapers, maps, prints, obsolete currency, oral histories, ephemera, and microfilm reflecting the history of Maryland and its people.

MdHS strives to make its collections even more accessible through on-line resources that include more than 6,000 photographs and detailed finding aids. The library enables researchers, students, teachers, and others to have access to the records of the past while preserving irreplaceable historical materials for future generations.