This is Thrilling Wonder Stories for December 1948, cover by Earle Bergey. The ISFDB entry for this issue is here. The version of the cover above is extracted from the copy of this issue preserved at the Internet Archive. The index at Galactic Central has a smaller version of the cover which hasn’t been marked by some used bookstore clerk (seriously, what kind of thoughtless vandal marks a cover like that?).

You can read and download the entire issue at the Internet Archive.