Popular Science 1921-12
Cover of the December 1921 issue of Popular Science magazine. Public domain scan of a magazine cover, free to use, no copyright restrictions image - Picryl description
Popular Science November 1921
Cover of Popular Science, November 1921
Popular Science 1921-02
Cover of the February 1921 issue of Popular Science magazine.
Popular Science 1921-05
Cover of the May 1921 issue of Popular Science magazine. Public domain scan of a magazine cover, free to use, no copyright restrictions image - Picryl description
Popular Science 1921-03
Cover of the March 1921 issue of Popular Science magazine. Public domain scan of a magazine cover, free to use, no copyright restrictions image - Picryl description
Popular Science 1921-07
Cover of the July 1921 issue of Popular Science magazine.
Popular Science 1921-06
Cover of the June 1921 issue of Popular Science magazine.
Popular Science 1921-01
Cover of the January 1921 issue of Popular Science magazine. Public domain scan of a magazine cover, free to use, no copyright restrictions image - Picryl description