1/2 "ace double" M-121 published tete-beché with
"alpha yes, terra no!" by emil petaja, q.v.
ace books, inc. 1120 avenue of the americas new york n.y.10036
96pp incl. titles+1p advert. for "world's best science fiction: 1965" edited by donald a. wollheim & terry carr, ace G-551
cover by ed valigursky, 1/4p initial b+w illo by jack gaughan