You’re welcome. Coincidentally, that issue is one I vividly remember because of the cover. When my father’s friend gave to me the issues that my father had given to him before going off to the Occupation of Japan, as I described in another post, that was the first one I looked at. The flag on the cover was something that all the magazines in the U.S. were asked to do simultaneously that month, as a patriotic display, and most complied.
BTW, “Collision Orbit” by Will Stewart was not the work of a new author, as the TOC pretends. Stewart was the pen name of the great Jack Williamson, and that story was the first of his stories about antimatter as an energy source. These were collected in a fix-up novel titled Seetee Shock (1949), and he wrote a prequel, Seetee Ship (1951). According to Sam Moskowitz, Williamson had proposed a series of stories about the engineering problems of planetary colonization, and Campbell, who had a degree in physics, suggested adding antimatter. Ironically, Williamson was the first SF author to describe antimatter, in a 1931 or 32 story, just 4 years after Dirac had mathematically proposed it (IIRC).