On the subject of "lost" & obscure, difficult-to-find scifi works: never before freely available online (& bloody hard to find at all); I FINALLY finished typing & formatting it (from optical scans of the original magazine edition).
https://biblio.wiki/wiki/The_Challenge_from_Beyond_(Weinbaum,_Wandrei,_Smith,_Vincent,_Leinster) - this link may not format correctly on steem, use copy & paste
& for good measure, here is the slightly-less-obscure "weird fantasy" tale using the same title:
https://biblio.wiki/wiki/The_Challenge_from_Beyond
both items are now in the public domain (USA, canada, & many others); principally due to non-renewal of copyright in the usa @ the 28-year mark (old rules)