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All these books are free to read: either they're distributed with a free license, or they're in the public domain.
These Creative Commons Attribution-NonCommercial-NoDerivs licensed ebooks are free to read - the people who created them want you to read and share them.
You are free to: copy and redistribute the material in any medium or format; under the following terms: You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.; you may not use the material for commercial purposes; if you remix, transform, or build upon the material, you may not distribute the modified material.
These books do not seem to be included in the Directory of Open Access Books.
