Lost Sci-Fi Books 106 thru 110

Lost Sci-Fi Books 106 thru 110 - Five Lost Sci-Fi Short Stories from the 1940s, 50s and 60s
Z by Charles L. Fontenay - Time reversal exists at the sub-atomic level according to Feynman's Theory—and according to that same theory any entity can exist in three places at one time.... Does this explain, the strange co-existence of Summer, Mark and Wyn?Your Servant Sir by Sol Boren - We all know that every android has its little idiosyncrasies. But what can a civilized human being do about it when his perfect servant drives him crazy?The Robot Who Wanted To Know by Harry Harrison - Did he have a right to feel this way? was this really forbidden by law—this wonderful frightening emotion!Day of the Hunters by Isaac Asimov - This man had a new slant on the mystery of what happened to the dinosaurs.Tanks by Murray Leinster - Two miles of American front had gone dead. And on two lone infantrymen, depended the outcome of the war of 1932.