Teitl clawr = Cover title.
OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
Cynllun lleol asiantaeth yr amgylchedd by Environment Agency Wales. Published by Asiantaeth yr Amgylchedd Cymru in 1998. Publication and catalogue information, links to buy online and reader comments.
obnb.uk is a Good Stuff website.