• College Trigonometry
  Carl Stitz and Jeff Zeager – PDF 5.1 MB

• Elementary Algebra
  John Redden – PDF 79.8 MB, Saylor Foundation

• Elementary Algebra
  Wade Ellis, Denny Burzynski – PDF 10.7 MB

• Fundamentals of Mathematics
  Denny Burzynsk, Wade Ellis – PDF 8.5 MB

• Precalculus
  Thomas Tradler, Holly Carley – PDF 3.3 MB

• Precalculus: An Investigation of Functions
  David Lippman, Melonie Rasmussen - PDF 3 MB

• Precalculus  (Main Textbook in this course)
  Openstax College Textbook – PDF 81.5 MB 

• Prealgebra (Secondary Textbook in this course)
  Openstax College Textbook – PDF 15.5 MB

• Formal Logic 
  An Introduction to Formal Logic Textbook – PDF 639 KB

• Sets, Logic, Computation
  Open Logic Text – PDF 2.8 MB

• Introductory Statistics
  Openstax Textbook – PDF 7.7 MB