There are two extensive collections of Frankfurter's papers: one at the Manuscript Division of the Library of Congress and the other at Harvard University. Both are fully open for research and have been distributed to other libraries on microfilm. However, in 1972 it was discovered that more than a thousand pages of his archives, including his correspondence with Lyndon B. Johnson and others, had been stolen from the Library of Congress; the crime remains unsolved and the perpetrator and motive are unknown.