Digital library
Textbooks, references and open learning resources.

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Basic Engineering Science - A Systems, Accounting, and Modeling Approach
Donald Richards · Rose-Hulman Institute of Technology · 2001
This textbook is based on a different paradigm for organizing an engineering science core --- a systems, accounting and modeling approach --- that emphasizes the common, underlying concepts of engineering science. Although this approach is not new, as most graduate students have been struck by this idea sometime during their graduate education, its use as the organizing principle for an undergraduate curriculum is new. By focusing on the underlying concepts and stressing the similarities between subjects that are often perceived by students (and taught by faculty) as unconnected topics, this approach provides engineering students a foundational framework for recognizing and building connections as they travel through their education.

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World History II: From 1400 (OpenStax)
OpenStax · LibreTexts
In the contents: 01: Understanding the Past · 1.04: Causation and Interpretation in History · 1.7.02: Check Your Understanding Questions

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OpenStax Biology 2e for Norco College
teresa friedrich finnern · Norco College
In the contents: 1.02: The Science of Biology · 1.03: Themes and Concepts of Biology · 2.02: Atoms Isotopes Ions and Molecules - The Building Blocks

External
Clackamas Biology 112 OER Textbook (OpenStax)
Jennifer Bown · Clackamas Community College
In the contents: 1.01: The Science of Biology · 1.02: Themes and Concepts of Biology · 1.03: The Process of Science