Which Dewey Decimal numbers are used for history and geography?

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British Museum: Reading Room — library Reading Room of the British Museum, designed by Sidney Smirke in collaboration with Anthony Panizzi and built in the 1850s. Illustration by Smirke, from the *Illustrated London News*, 1857.

In the Dewey Decimal Classification system used by a library, the numbers 900–999 are designated for history, biography, and geography.1

These main groups are further subdivided to provide more specific subject categorization. For example, the history of Europe is found in the 940s, while the history of England is specifically located at 942.1