"Edited by Richard Farmer" - t.p. verso.
Ar y clawr = On cover: Severn Trent Water.
Llyn Efyrnwy : ffermio a chadwraeth : astudiaeth achos = Lake Vyrnwy : farming and conservation : a case study. Published by Y Gymdeithas Frenhinol er Gwarchod Adar a Dŵr Hafren Trent Cyf in 2005. Publication and catalogue information, links to buy online and reader comments.