Adventures in Time and Space (eds. Healy & McComas)

The key reprint tell is collation. A copy collating 824 pp, with the last five stories absent, is a later shortened printing and never the first. Sources conflict on when that shortened text appeared — dealer collations attribute it to the fourth printing of August 1950, while Wikipedia describes a shortened 'second edition' issued in 1946 — but the 997-pp versus 824-pp distinction is decisive regardless of which date is right. Any copy lacking the full 997 pp is not the first printing.