DC Public Library System
608
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http://bibfra.me/vocab/lite/Category
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608
Code
608
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ddc
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8
The total inventor's manual, Sean Michael Ragan
One hundred patents that shaped the modern world, David Segal
Patents, ingenious inventions : how they work and how they came to be, Ben Ikenson
Patent searching made easy, how to do patent searches online and in the library, David Hitchcock
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