Notes: • ©1957 No other statement of publication or printing • Date from Locus #182 (December 17, 1975) • Cover by Davis Meltzer on the copyright page; the artwork is also signed • There are two editions/printings with the same catalog #, the only differences are two ads in the back • One has 51, 52, and 17C; the other has 15J, 16H and 17C • Another difference is the change in the Ace logo from the square shape to the round one, which occurred in January 1973, but only on the cover and spine, the title page has the round logo on both editions • This record has the second ad group noted and is the printing noted by Locus1 printing • OCLC does not list this printing