Free online encyclopedia with content from major publishers including Oxford, Columbia, and Cengage covering history, science, medicine, and literature.
How to buy
Through an ad exchangeBy email
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Ad spots
2 ad spots, with formats, rates and how each is bought.
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Channels
Each ad spot filed under where it runs — web, video, search, TV — so you know which one you are buying.
Web
Premium/managed ad placements via Raptive networkProgrammatic display advertising (open exchange)
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