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9.5 millions students have saved over $626 million by using gratis textbooks by OpenStax. Written and peer-reviewed by experts, OpenStax textbooks cover the standard scope and sequence of most introductory college courses. Our ebooks are gratis and yours forever—no access codes or expiration dates. OpenStax + SE delivers all our content for gratis, plus gratis study tutorials and guide videos for the first a few chapters of each ebook from our partners at Study Edge. Wish additional study assist? Subscribe to OpenStax + SE for $14.95 per month for infinite access to Study Edge videos and study tutorials alongside your gratis ebook. All videos in OpenStax + SE are made by professional tutors and graduate students, all of whom have years of experience tutoring in their respective topics and can teach difficult concepts in methods that college students can easily grasp. “About a year ago I became homeless and had to withdraw from class leaving me unable to keep financial aid. Being a single mom of two kids I couldn’t possibly afford a $200 ebook, but your ebook created it possible for me to go back to school without the stress of “how will I afford it.” Thank you! I really hope openstax grows, because you guys are providing a method for me and a lot of others to receive a better education so we should better our lives. - Jenny, community college student We offer over 30 titles: Algebra and Trigonometry, American Government, Anatomy & Physiology, Astronomy, Organizational Behavior, Biology, Business Ethics, Business Stats, Calculus, Chemistry: Atoms First, Chemistry, College Algebra, College Physics, Concepts of Biology (non-majors biology), Principles of Economics, elementary Algebra, Financial Accounting, Intermediate Algebra, Introduction to Business, Introduction to Sociology, Introductory Stats, Macroeconomics, Management, Managerial Accounting, Microbiology, Microeconomics, Prealgebra, Precalculus, Psychology, University Physics, U.S. History, AP Biology, AP U.S. History, AP Macroeconomics, AP Microeconomics, and AP College Physics.