Digital library
Textbooks, references and open learning resources.
External
Acoustics
Wikipedia · LibreTexts
Acoustics is the science that studies sound, in particular its production, transmission, and effects. The science of acoustics has many applications which are dependent upon the nature of the sound that is to be produced, transmitted or controlled. In the case of a desirable sound, such as music, the main application of acoustics is to make the music sound as good as possible.

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Commonsense Composition
Crystle Bruno · CK-12
This textbook follows California Language Arts Standards for grades 9-12 to provide a generalized understanding of composition and to serve as a supplementary aid to high school English teachers.

External
Human Biology - Digestion and Nutrition
CK-12 Foundation · LibreTexts
The Digestion and Nutrition Student Edition book is one of ten volumes making up the Human Biology curriculum, an interdisciplinary and inquiry-based approach to the study of life science.

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Journalism 101
CK-12 Foundation · LibreTexts
Journalism is unbiased production and distribution of reports on current or past events based on facts and supported with proofs or evidences.
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Jane Good - Elementary- Curation 4th Grade-Reading-and-Writing-Trimester-1.zip
LibreTexts
LibreTexts

External
Philosophy
CK12 · LibreTexts
Philosophy is the study of general and fundamental questions about existence, knowledge, values, reason, mind, and language. Such questions are often posed as problems to be studied or resolved. Major sub-fields of academic philosophy include metaphysics, epistemology, ethics, aesthetics, political philosophy, logic and philosophy of science.

External
Leadership in Early Care and Education
Tammy Marino, Maidie Rosengarden, Sally Gunyon, & Taya Noland · Southwestern Oregon Community College & Portland State University
In the contents: 01: Leadership- An Introduction to Leadership Skills in Early Childhood Care and Education · 06: Current Issues in the Field of Early Childhood Education

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Economics
El Paso Independent School District · CK-12
In the contents: 5.13: Education and Employment · 6.01: CK-12 Glossary · EDF 4550: Critical Focus on Education

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Digital Photography Basics
Politzer · CK12
Whether you just got a digital camera (or smart phone), are new to photography, or have a little experience, this course is for you. Each chapter will provide you with information, examples, opportunities to develop your skills, and time to reflect on what you've learned. Instead of a traditional end-of-course final, you'll be guided in the development of a digital photo portfolio to demonstrate your skills.

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United States Government
El Paso Independent School District · LibreTexts
El Paso Independent School District in El Paso, Texas created this US Government text for its high school course using OER, CC, and public domain content from a variety of sources curated by educators in the district. The course is aligned to the Texas TEKS and is usually taken in Grade 10.

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Engineering: An Introduction for High School
Dale Baker, Ed.D., Tirupalavanam G. Ganesh, Ph.D., Stephen Krause, Darryl Morrell, Chell Roberts, & Janel White-Taylor · CK-12
Introduces engineering techniques and practices to high school students. This book is designed for a broad range of student abilities and does not require significant math or science prerequisites.

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International Advances in Writing Research - Cultures, Places, Measures
Bazerman et al. · LibreTexts
In the contents: 2.01: Academic Writing Instruction in Australian Tertiary Education- The Early Years · 2.04: Multimodality in Subtitling for the Deaf and the Hard-of-Hearing Education in Brazil · 3.01: Rethinking K-12 Writing Assessment to Support Best Instructional Practices

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Analysis
CK-Foundation · LibreTexts
LibreTexts

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Precalculus
CK12 · CK12
LibreTexts

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Earth Science
CK-12 Foundation · LibreTexts
LibreTexts

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Geometry
CK-12 Foundation · LibreTexts
Geometry is one of the oldest branches of mathematics and is concerned with properties of space that are related with distance, shape, size, and relative position of figures.

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Measurement
CK-12 Foundation · LibreTexts
LibreTexts

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Calculus
CK-12 Foundation · LibreTexts
LibreTexts

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Geography
El Paso Independent School District · CK12
LibreTexts

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Astronomy for Educators
Daniel E. Barth · University of Arkansas, Fayetteville
Astronomy for Educators provides new and accomplished K-12 instructors with concepts and projects for low-cost, high-impact STEM classroom instruction that is built around the National Academies National Research Council's K-12 Framework for Science Education.