D.C. Code § 39-123

Any books of a miscellaneous character no longer required for the use of any executive department, or bureau, or commission of the government, and not deemed an advisable addition to the Library of Congress, shall, if appropriate to the uses of the free public library of the District of Columbia, subject to applicable regulations under the Federal Property and Administrative Services Act of 1949, as amended, be turned over to that library for general use as a part thereof.