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The Engines of Our Ingenuity (Popularity:  )
Transcripts of a radio program exploring technology and culture.
Category: Science\Science in Society
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Tips and Tricks to Gothic Geometry (Popularity: )
Full explanatory diagrams for constructing your own rose window, ogee arch, and trifoil tracery.
Category: Science\Math\Geometry\Sculpture and Art
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Universal Rock Shop (Popularity: )
Large selection of mineral specimens from around the world for sale online. Nice accompanying descriptions ...
Category: Science\Earth Sciences\Geology\Rocks and Minerals
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Geosol Imports (Popularity: )
Direct importers of Amethyst Cathedral geodes from Brazil. All shapes and sizes are available.
Category: Science\Earth Sciences\Geology\Rocks and Minerals
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