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Giles' Dewey Decimal Section:
503 Dictionaries & encyclopedias
R. Giles = 4949 = 494+9 = 503
Math, astronomy, prehistoric life, plants and animals.
What it says about you:
You are fascinated by the world around you, and see it as a puzzle worth exploring. You try to understand how things work and how you can make them better. You might be a nerd.