Pwy yw pwy yn yr amgylchedd.
By: wedi ei grynhoi a'i olygu gan Sarah Cowell.
Contributors: Cowell, Sarah.; Environment Council (Great Britain)
Publisher: Cyngor yr Amgylchedd
Published: 1991
Place of publication: Llundain
Language: wel
Number of pages: 65
Subjects: Ecology -- Wales -- Directories.; Environmental protection -- Wales -- Directories.