Pyramid Books, 1964, paperback original. Collects these sci-fi tales: Won't You Walk? (1956) by Theodore Sturgeon; Sense of Proportion (1958) by E. C. Tubb; Trojan Horse Laugh (1949) by John D. MacDonald; Some Day We'll Find You (1942) by Cleve Cartmill.
Used availability for Groff Conklin's Dimension 4