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"The British Library Document Supply Centre (BLDSC) and the Regional Library Systems have collaborated in the production of revised guidelines"--Introduction.
OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
Directory of library codes 1999 : including guidelines to the National Network for Interlending and Document Supply. ISBN 0712311173. Published by Document Supply Centre in 1999. Publication and catalogue information, links to buy online and reader comments.