OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
'The complete Chris Orr' : prints, published and unpublished, 1967-76 : [an exhibition held at Whitechapel Art Gallery, 2nd June-4th July 1976] by Whitechapel Art Gallery. ISBN 0854880313. Published by The Gallery in 1976. Publication and catalogue information, links to buy online and reader comments.
!['The complete Chris Orr' : prints, published and unpublished, 1967-76 : [an exhibition held at Whitechapel Art Gallery, 2nd June-4th July 1976]](http://ecx.images-amazon.com/images/I/511Ah3Lk4ML._SL160_.jpg)