Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
Some tests on Yielding Props in German Collieries (booklet)
Translation of an article entitled ' Ergebnisse nauer Untersuchungen an Stempeln Verschiedener Abbaustreben' by Oberbergrat Otto Kuhn which appeared in Glückauf, 88 (1952), No. 25, 26. Information Bulletin. 6 pages.
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.