There is a book:
CAVES OF THE LAKI FIRES /A Gazetteer of the Caves Mapped by the Laki Underground Expeditions of 2000 and 2001 Ed Walters et al. A monograph on lava caves in Icleand [pub as] Shepton Mallet Caving Club Jl Ser 10 No 10 Autumn 2001 pp 337 - 418.
GEYSERS AND HOT SPRINGS IN ICELAND by Bj?rn Hroarsson and Sigurour S Jonsson 1992 158 pp over 150 colour photos maps etc. Land of Fire and Water, Iceland is famous for its geothermal activity. Only one of these springs is in a cave. Beautifully illustrated with high quality photos printed on art paper. In English. HB DW
ICELANDIC PICTURES drawn with pen and pencil by Frederick W W Howell 1893 176 pp numerous illus and map. With a description and engraving of Surtshellir - the most famous cave in Iceland. Complete with original picture cover. HB
LAKI UNDERGROUND 2000 The Bournemouth / Dundee Universities Joint Expedition to Iceland / Expedition Report by Chris Wood et al. May 2001 36 pp, 14 figs. Numerous caves were discovered, explored and written up. SB glossy A4 together with:
LAKI UNDERGROUND 2001 The Bournemouth and Shepton Mallet Caving Club Expedition to Iceland / Expedition Report by Chris Wood et al. May 2002 32 pp, 13 figs. Numerous caves were discovered, explored and written up. SB glossy A4.
REPORT OF THE SMCC EXPEDITION TO THE REYKJANES PENINSULAR June 2003 [in] Shepton Mallet Caving Club Jl Ser 11 (4) Autumn 2003 pp 76-186, illus. Over 50 Icelandic caves described and surveyed. An important work. SB
SURTUR / Icelandic speleological Society's Bulletin 1992 Vol 3 77 pp many B&W photos. Numerous cave descriptions, surveys etc. Searching for caves; On the flanks of Heroubreid etc. In Icelandic with English Summary. SB
THE SUBTERRANEAN WONDERS OF ICELAND by M T Mills 1981 19 pp location map 209 references. An invaluable introduction to the caves of `The Land of Fire and Water'. SB