[USED] The Postojna Grottoes and other marvels of the Karst
Dr Alfred Serko and Ivan Michler, Sb, A6, 59pp, Postojna 1967, Translated to English.
£3.00
[USED] The River Scenery At The Head Of The Vale Of Neath
F. J. North, SB, 110pp, The National Museum Of Wales (1949)
£3.00
[USED] Wind Cave: An Ancient World Beneath the Hills
Arthur N. Palmer, paperback, 62 pages, Black Hulls Parks and Forests Association, 1995.
£2.00
[USED] Zauber der Höhlen . Im Reich des Karstes und der unterirdischen Wasser.
Alfred, Bögli, hardback, 158 pages, Silva-Verlag, 1976.
£4.00