CK-12 Foundation is a non-profit organization with a mission to reduce the cost of textbook materials for the K-12 market both in the U.S. and worldwide. Using an open-content, web-based collaborative model termed the “FlexBook,” CK-12 intends to pioneer the generation and distribution of high quality educational content that will serve both as core text as well as provide an adaptive environment for learning.
These are available as PDF downloads.
Page listing available books with PDF links.
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Scribd is another document distribution source (like Youtube for documents) that will allow one to upload files and then embed them into webpages as a flippable book, a scrollable page or a slideshow. Here's the CK-12 Chemistry Book.
Controls at the bottom left allow the view to see book, scroll or slide view.
I can also embed them in an existing webpage:
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