Deletion of Barkham Burroughs' Encyclopaedia

Comment: Here's  articles: https://www.newspapers.com/clip/57187589/dan-webster-on-astounding-facts/https://www.newspapers.com/clip/57187643/chuck-palmer-on-astounding-facts/https://www.newspapers.com/clip/57187547/connie-long-on-astounding-facts
Stance: keep
Cited policy: Wikipedia:Reliable sources (WP:THREE)