| http://www.w3.org/ns/prov#value | - sales of academic and ESL books" as including all commonly understood products falling within this broad category, such as elementary, secondary, and college-level textbooks as well as English as a Second Language courseware, irrespective of product packaging, formulation, size, or form (e.g. the retail sales of products sold by publishers such as Pearson Education, Thomson Learning, and Palgrav
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