Porth yr Ogof, Ystradfellte, Powys: A revised survey. (UBSS Proceedings v.15(3))
Proceedings » Volume 15 » Sub-volume 3
Lloyd,O.C., 1980. Porth yr Ogof, Ystradfellte, Powys: A revised survey..
UBSS Proceedings, 15(3) , pp 259-0 Download PDF.
Abstract: This revised survey includes all discoveries made since the publication of the original version in 1970.