When Geeks Rule The World And Get The Girl - Cover art by Robert Swanson, if, Worlds of Science Fiction magazine, Oct. 1954 (via Neatorama)
He was the Bachelor Father of a Problem Child - Love Tales Weekly, June 1938 (image via James Vaughan)
Journal Of Technology, January 1969 - Cover art of Russian science/tech magazine equivalent to Popular Science in the U.S.
Alfred E Neuman In Space - MAD Magazine Sweden cover art, November 1969
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Radio Robot Plane aka Drones ~ Illustration: Alex Schomburg, Radio Craft Magazine, August 1945 (via MagazineArt.org)
Source: magazineart.org
Life In GM Brazil magazine cover, November 1952 (via Nemojp Dante )
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Test Tube Baby -- Will Burtin, Cover for Scope magazine, USA, 1948
Source: theredlist.com