Termau bioleg, cemeg, gwyddor gwlad.
Contributors: Cyd-bwyllgor Addysg Cymru.; Welsh Joint Education Committee.
Publisher: Cyd-bwyllgor Addysg Cymru
Published: 1982
Place of publication: [Caerdydd]
Language: wel
Number of pages: 90
Notes: At head of title: Cyd-bwyllgor Addysg Cymru.