File:PopularScienceJuly1923.png
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![File:PopularScienceJuly1923.png](https://upload.wikimedia.org/wikipedia/commons/thumb/3/30/PopularScienceJuly1923.png/423px-PopularScienceJuly1923.png?20200428164200)
Size of this preview: 423 × 599 pixels. Other resolutions: 169 × 240 pixels | 339 × 480 pixels | 684 × 968 pixels.
Original file (684 × 968 pixels, file size: 1.59 MB, MIME type: image/png)