USA: UFO articles from "Popular Science" (1950s onwards) : Area 51, Rendlesham, and skeptical theories (including by Donald Menzel)

"Popular Science" magazine has published a number of UFO articles from the 1950s onwards.  

These have included material on Area 51, SETI and the Rendlesham Forest incident, plus material on skeptical theories regarding UFOs (including by Donald Menzel regarding mirages).

Thanks to the AFU in Sweden and Mikhail Gershtein in Russia, scans of these articles are now available.

I'm not sure whether to include the most recent material (although it seems common to see copies of news articles posted on UFO websites, Facebook etc so perhaps I'm worrying over nothing...).

Click on the image below for a link to the relevant folder I've created on the AFU's website.