From Smithsonian Libraries and Archives Blog Post:
To celebrate National Library Week and the start of spring, we’ve put together another round of digital jigsaw puzzles!
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Each puzzle is set at about 100 pieces but they are customizable to any skill set. Click the grid icon in the center to adjust the number of pieces. All of the images are available in our Digital Library, Image Gallery, Biodiversity Heritage Library or Smithsonian Institution Archives Collections. Feel free to explore and make your own!