Campbell's novella was originally published in the August 1938 issue of Astounding Science-Fiction under the title Who Goes There?, but by 1952, when this edition reportedly appeared (there's no date inside), the story had become the basis of the Howard Hawks movie, hence the re-titling. The excellent Bear Alley blog has the details of the Fantasy Books line here.
UPDATE: The Withnail Books copy has now SOLD.
The story didn't make the cover of Astounding back in 1938, but was given pride of place when Shasta published a collection of Campbell's stories in 1948, with a truly bonkers dust jacket design by Hannes Bok.
Be prepared to pay comfortably into three figures for a copy of the Shasta edition which still has its wrapper, even more comfortably if it's one of the 200-odd (out of the 3,000 print run) which was signed by Campbell.
There's a later Shasta printing – post-movie – with a different design.
Nice, but the Bok definitely wins. To round off, here's a choice selection of The Thing things, from other early editions through to the essential John Carpenter movie (with its US one sheet painted by Drew Struzan in the course of one night, so tight was his deadline) and beyond...
(Those last three are Mondo prints by Tyler Stout, Randy Ortiz and Jock respectively. No, you can't get them any more – like all Mondo prints, they sold out in seconds – and no, you can't afford to buy them on the secondary market, even if you can find one for sale...)