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A collaboratively written mathematics encyclopedia

Minnesota historical entries filterable by topic and era

Oklahoma history searchable by name, era and topic

Louisiana reference entries across history and culture

Biographical and bibliographical reference to classical scholarship

Overlay astronomical catalog data on sky images

A searchable reference to science-fiction writing and subjects

An A-to-Z route into global public-health subjects

A browser-game catalogue for casual and multiplayer play

Monthly recommendations from independent booksellers

Indonesia's cross-government data portal

A collection of dictionaries, companions and encyclopedias