Note: Nesvadba's first massmarket, retrospective collection containing 16 stories from all three previous original ones (2 out of the 4 fantastic among 13 in Tarzanova smrt, 1958; 7 of 11 in Einsteinův mozek, 1960; and 7 of 9 in Výprava opačným směrem, 1962). Obviously it has nothing in common with the 1962 German coll of the same (translated) title, which selects only from the two earlier ones; the composition of later translated collections also differs substantially enough for them not to count as variants.