Tell me about German Historical Institute (GHI) which is situated in Washington DC.
This institute provides good library facility.
The GHI Library offers free access to researchers, historians, scholars, and the general public.
Monday - Thursday: 9 am to 5 pm, Fridays: 9 am to 4 pm, and by appointment.
Researchers can check the library's holdings in the online catalog.
For more information here I am giving you its contact details.