Hydrothermal Ore Deposits of the Bohemian Massif : Guide to Excursion 22 AC Czechoslovakia, German Democratic Republic, [které se budou konat] 8.8.-17.8.1968, 10.8.-16.8.1968, 30.8.-8.9.1968, 31.8.-6.9.1968 / Prepared by Jan H. Bernard, Hans J. Rösler, Ludwig Baumann in co-operation with [kol.] .  Praha :  Academia,  1967 .  51 s.