Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
Dept of Energy, information on alternative energy
Booklet 'Drawing Heat from the Earth - geothermal energy technology in Britain'. 16 pages, stapled.
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.