Free as in Freedom [Paperback]: Richard Stallman's Crusade for Free Software
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Free Software Free Society, 2nd Edition
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Free Software, Free Society: Selected Essays of Richard M. Stallman
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GNU Make Reference Manual
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Linux & Python for Raspberry Pi: Getting First Program with Python
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GNU Coding Standards
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Python with OpenCV3: Computer Vision Course for Beginners
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Using GCC: The GNU Compiler Collection Reference Manual for GCC 3.3.1
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