Fill in the Blanks 167-testOnline version 167-test by Farhad Key 1 research preserve benefits readers preserved recorded intellectual become ensure Legal deposit has exist in English law since 1662 . It helps to that the nation's published output ( and thereby its record and future published heritage ) is collected systematically , to the material for the use of future generations and to make it available for within the designated legal deposit libraries . The Legal Deposit Libraries are the British Library , the National Library of Scotland , the National Library of Wales , the Bodleian Libraries , Oxford and the University Library , Cambridge . The legal deposit system also has for authors and publishers : Deposited publications are made available to users of the deposit libraries on their premises , are for the benefit of future generations , and became part of the nation's heritage . Publications are in the online catalogs and an essential resource for generations to come .