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"Report ref. no. 04/WW/04/9; 04/WW/04/10".
CD-ROM in pocket attached to inside front cover of vol. 1.
v. 1. Sustainability and the water industry
v. 2. BPSO methodology handbook.
OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
Sustainable WwTW for small communities. ISBN 1840573244. Published by UK Water Industry Research Limited in 2004. Publication and catalogue information, links to buy online and reader comments.