Gwerth ein hamgylchedd : gwerth economaidd amgylchedd Cymru : crynodeb technegol = Valuing our environment ; economic impact of the environment of Wales : technical summary.
National Trust (Great Britain)
Llandudno : Ymddiriedolaeth Genedlaethol,
2003.
Teitl clawr = Cover title.
Testun tu fewn i'r cloriau = Text on inside covers.
Environmental protection