My original tumblr post was here. This iamge was originally posted on tumblr by Vintage Geek Problem. This is the February 1940 cover for Thrilling Wonder Stories, done by Harold V. Brown. The ISFDB entry for this issue is here.
My original tumblr post was here. This is the December 1950 cover of Out of this World Adventures, a pulp magazine that was edited by Donald A. Wolheim and appears to have only had two issues; the ISFDB entry for the magazine is here. I found the cover tweeted by Victor M. Luoma. I’ve been unable to ascertain the identity of the artist, but I did find a larger version of the same image at Retrospace.
My original tumblr post was here. These images were originally posted on tumblr by Diabolik Diabolik and identified as being from Planet Stories #11, 1942 (that would be Summer 1942; the ISFDB link for the issue is here), with an attribution of the cover art to Norman Saunders and the interior art to Winfield Scott Hoskins. The post comes to us via paranormallust-eroticart.
My original tumblr post was here, from a tweet by 1whoknewcthulhu. There is a gallery of pulp and men’s magazine art by Walter Popp here which I strongly encourage you to visit. If you don’t thrill to a piece illustrating “Italian Nudist Girls Who Knocked Out Germany’s Underground Tank Depot,” perhaps you should check yourself for a pulse, just to be sure.
My original tumblr post was here. I reblogged the image from this tweet with the explanatory text “Tweeted by Retro Ninja @Nero222.” What the photographer is so shocked at I am uncertain, though I think it would be cool mad science if you had a camera that made the model from the image, rather than the other way round. As it is, this appears to be an example of Mexican pulp art.
My original tumblr post was here. This image is the Spring 1957 issue of Space Science Fiction Magazine (one of only two issues). The ISFDB entry for the issue is here. The artist who created the cover is listed as Tom Ryan. The image was first posted on Tumblr by Vintage Geek Culture and comes to us via Not Pulp Co vers.