@article {12157,
	title = {S{\'\i}lfidos cavern{\'\i}colas de la regi{\'o}n de Castro Urdiales (Santander)},
	journal = {BSeh},
	volume = {17},
	year = {1917},
	pages = {207-211.},
	author = {Bol{\'\i}var, C.}
}
