When a book is deposited for registration, accompanied by the claim for copyright, preferably on the application form gratuitously provided by the Copyright Office, its class designation, with its accession or sequence number in that class, is at once stamped upon the deposit copy or copies, with the date of receipt, and also upon a green record slip on which all details in the progress of the work through the Copyright Office are recorded with exact time of each act and the initials of the respective clerks. This record, when completed, shows, besides the class number and the title of the work, the date and hour of the receipt of deposit copies and of the receipt of application, affidavit and fee, with memorandum of the disposition of the fee if out of the ordinary course; the examination of the application and affidavit, the preparation of the white card for printer's copy, and the clearance of the work. Thus cleared, the book is ready for examination by the Library Commission, the delivery of one copy to the Catalogue Division of the Library of Congress, the making of the certificate and its record and the making of the index cards, all of which acts are performed usually on the day of receipt, or otherwise as early as practicable on the following day. The record slip also provides for noting and notifying claimants of defects as to the deposit copies or the application for copyright, and for noting also the reference to other departments, and the disposition of second deposit copies. {Sidenote: Treatment of deposits} The deposit copies, as entered on day of receipt and stamped with date, group and accession number, are placed on a table for inspection by what is known as the Library Commission of the Library of Congress, consisting of the Assistant Librarian, the Superintendent of the Reading Room and the Chief of the Catalogue Division, who decide which books are desired for the Library of Congress, and whether one or two copies thereof are required; one copy not so required is retained as part of the records of the Copyright Office. Accumulations of the past years and current accessions were until recently stored in the sub-basement of the Library of Congress building, but a new stack now furnishes abundant and well-lighted space for deposit copies and gradually all deposit articles will be removed to this stack. The new provision for the destruction of useless material happily prevents the continuing storage of such material to an indefinite future. {Sidenote: Destruction of useless material}