OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
John Davies : [catalogue of an exhibition held at the] Whitechapel Art Gallery, 21 June to 16 July 1972 by John Davies. ISBN 0854880097. Published by Whitechapel Art Gallery in 1972. Publication and catalogue information, links to buy online and reader comments.
![John Davies : [catalogue of an exhibition held at the] Whitechapel Art Gallery, 21 June to 16 July 1972](http://ecx.images-amazon.com/images/I/51cnRr06ZeL._SL160_.jpg)