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The Library of Congress Prints and Photographs Division's holdings complement a variety of resources both within the Library of Congress and at other institutions that support the study of buildings in Washington, D.C.
Prints and Photographs Division staff maintain this useful guide, which offers search strategies and overviews of resources for researching Washington, D.C., sites and structures.
The Manuscript Division has also published a research guide related to researching Washington, D.C. history, which includes links to external sites that may be helpful in your search: https://guides.loc.gov/washingtoniana-manuscripts/websites
Manuscript Division Reference Staff