'... [photographs] on view at the National Portrait Gallery annexe at 15 Carlton House Terrace from 30 January to 4 April 1976'.
OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
Paul Strand : [catalogue of] a retrospective exhibition of this photographs, 1915-68 : [organized by the] National Portrait Gallery in association with the Arts Council of Great Britain by National Portrait Gallery. ISBN 0904017052. Published by National Portrait Gallery (Great Britain) in 1976. Publication and catalogue information, links to buy online and reader comments.
![Paul Strand : [catalogue of] a retrospective exhibition of this photographs, 1915-68 : [organized by the] National Portrait Gallery in association with the Arts Council of Great Britain](http://ecx.images-amazon.com/images/I/41Np8TypnZL._SL160_.jpg)