Wikibooks. ‘Wikibooks is a collection of free instructional textbooks that are being written collaboratively by the readers of this web site. As an alternative to the proprietary model used by publishers of more expensive textbooks, Wikibooks uses the GNU Free Documentation License so that anyone may copy, modify, and reuse our textbooks. You can participate in Wikibooks by authoring and editing content on this site.’

Natural sciences department

Natural sciences bookshelf

Education bookshelf

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