CK-12’s Life Science delivers a full course of study in the life sciences for the middle school student, relating an understanding of the history, disciplines, tools, and modern techniques of science to the exploration of cell biology, genetics, evolution, prokaryotes, protists, fungi, plants, the animal kingdom, the human body, and ecology. This digital textbook was reviewed for its alignment with California content standards.

CK-12 Middle School Math Concepts for seventh grade provides a complete textbook. It presents topics including algebraic thinking, patterns, decimals, decimal operations, fractions, fraction operations, integers, integer operations, ratios, rates, proportions, percents, percent applications, equations, solving equations, inequalities, functions, graphing functions, geometry, plane geometry, solid geometry, area, perimeter, surface area, volume, statistics including mean, median, mode and range, graphing and types of graphs, and probability.

In CK-12 Middle School Math Concepts – Grade 8, the learning content is divided into concepts. Each concept is complete and whole providing focused learning on an indicated objective. Theme-based concepts provide students with experiences that integrate the content of each concept. Students are given opportunities to practice the skills of each concept through real-world situations, examples, guided practice and explore more practice. There are also video links provided to give students an audio/visual way of connecting with the content.

CK-12 Physical Science Concepts covers the study of physical science for middle school students. The 5 chapters provide an introduction to physical science, matter, states of matter, chemical interactions and bonds, chemical reactions, motion and forces, and the types and characteristics of energy.

CK-12 Foundation's Geometry FlexBook is a clear presentation of the essentials of geometry for the high school student. Topics include: Proof, Congruent Triangles, Quadrilaterals, Similarity, Perimeter & Area, Volume, and Transformations.

The text of Cabbages and Kings by O. Henry can be found here in multiple digital formats.

CK-12 Foundation's Single Variable Calculus FlexBook introduces high school students to the topics covered in the Calculus AB course. Topics include: Limits, Derivatives, and Integration.

CK-12's Texas Instrument Calculus Student Edition is a useful companion to a Calculus course, offering extra assignments and opportunities for students to understand course material through their graphing calculator.

CK-12's Texas Instruments Calculus Teacher's Edition is a useful companion to a Calculus course, offering extra assignments and opportunities for students to understand course material through their graphing calculator.

CK-12 Calculus Teacher's Edition covers tips, common errors, enrichment, differentiated instruction and problem solving for teaching CK-12 Calculus Student Edition. The solution guide is available upon request.

The complete text of this literary work is available to download or read online in multiple digital formats.

See the many things that the wind touches and moves as it blows about. Book includes audio narration in 21 additional languages with text in English.

Candide by Voltaire presented as an ebook by Project Gutenburg, formatted for online reading.

An online copy in plain text format of Kipling's work, easy to search and to use with online text readers.

This article by Jacob G. Hornberger is an essay in the book, The Case for Free Trade and Open Immigration, edited by Richard M. Ebeling and Jacob G. Hornberger. In it, Hornberger gives a hypothetical view of how life in the United States would be if free trade and unlimited immigration among states did not exist. He uses these hypothetical examples to argue for free trade and less restrictive immigration laws to improve economies and relations between countries.

An analysis of the conflicting views on the fundamental role of the government of the United States, specifically on the relationship between the different branches of the federal government, and what the Cato Institute regards as their unconstitutional growth of power.

By the end of this section, you will be able to do the following: Analyze whether monetary policy decisions should be made more democratically; Calculate the velocity of money; Evaluate the central bank's influence on inflation, unemployment, asset bubbles, and leverage cycles; and Calculate the effects of monetary stimulus.

By the end of this section, you will be able to do the following: Understand how fiscal policy and monetary policy are interconnected, Explain the three lag times that often occur when solving economic problems, and Identify the legal and political challenges of responding to an economic problem.

By the end of this section, you will be able to do the following: Analyze GDP per capita as a measure of the diversity of international standards of living; Identify what classifies a country as low-income, middle-income, or high-income; and Explain how standards of living are influenced by geography, demographics, industry structure, and economic institutions.

By the end of this section, you will be able to do the following: Analyze the growth policies of low-income countries seeking to improve standards of living; Analyze the growth policies of middle-income countries, particularly the East Asian Tigers, with their focus on technology and market-oriented incentives; Analyze the struggles facing economically-challenged countries wishing to enact growth policies; and Evaluate the success of sending aid to low-income countries.