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- Books – a book is a set of written, printed, illustrated sheets, made of ink, paper, parchment, or other materials, usually fastened together to hinge at one side. Books are used to convey knowledge and other information.
- General subject outlines (trees of knowledge)
- Taxonomies (trees) of knowledge included within larger works
- Subject classification systems
- Academic classification systems
- Library classification systems
- Knowledge – familiarity, awareness or understanding of someone or something, such as facts, information, descriptions, or skills, which is acquired through experience or education by perceiving, discovering, or learning. Knowledge can refer to a theoretical or practical understanding of a subject. It can be implicit (as with practical skill or expertise) or explicit (as with the theoretical understanding of a subject); it can be more or less formal or systematic.
- Wikipedia – free-access, free content Internet encyclopedia, supported and hosted by the non-profit Wikimedia Foundation. Anyone who can access the site can edit almost any of its articles. Wikipedia is the sixth-most visited website and constitutes the Internet's largest and most popular general reference work.