Excursion guide : B5CZ, Bohemian Karst / authors Karel Žák ... [et al.] .  Praha :  Czech Speleological Society : SPELEO2013 and in the co-operation with the International Union of Speleology,  2013 .  82 s., [1] l. obr. příl.   [1, currently available 0, at library only 1]