Free Calculus Textbooks
Here's a collection of calculus textbooks. These are top quality, and legally free.
• APEX Calculus by Gregory Hartman et al. Calculus__Gregory_Hartman_2014.pdf
• Calculus Volume 1. OpenStax project. calculus-volume-1-2.33.pdf by Gilbert Strang, Edwin Jed Herman, et al.
• Calculus from mooculus project. by Jim Fowler, Bart Snapp 2014. calculus_mooculus_jim_fowler__bart_snapp_2014.pdf
real analysis by Jiri Lebl 2016 real_analysis_by_Jiri_Lebl_2016.pdf