G.C. Cox, 1973. Caves of the Cantabrian Mountains, North-West Spain. Cave Science 51, 1-65
A monograph forming the whole of volume 51 of Cave Science,`published by the British Speleological Association (now incorporated into the British Cave Research Association).
Primarily an account of the work of British speleological expeditions in the Cantabrians, but including brief descriptions of caves explored by Spanish and French speleologists in the interest of giving a complete outline of known caves in the region.