John Gabriel
Link to free eBook:
https://drive.google.com/open?id=1CIul68phzuOe6JZwsCuBuXUR8X-AkgEO
How we got calculus:
https://drive.google.com/open?id=0B-mOEooW03iLczlDM2JLalYwcGM ... https://www.youtube.com/watch?v=A4kE53cG-SI
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