Here is information on how to request books from JHU libraries and have them sent to DC or any branch of the JHU libraries.

Essentially, find the book in the catalog; click Request, login with JHED and on the delivery screen, scroll down to find Washington Library Resource Center.

See the information on this page: http://guides.library.jhu.edu/find/books

Take a look at "Get books from other JHU libraries".