Original post here.
Original text:
STARTLING STORIES 99 issues ~ Jan/1939-Fall/1955 About half of the covers! Cover art by Howard V. Brown, Earle Bergey, Rudolph Belarski, Alex Schomburg, Jack Coggins, Walter Popp, Ed Emshwiller & Ed Valigursky
Update: A commenter has pointed us to a cleaner version of the same image.
http://www.philsp.com/data/images/s/startling_stories_195001.jpg
Try that for a better reproduction of the cover.
Thanks! And post updated in response.