Free+Digital+Textbooks

=media type="custom" key="8419692"= =**Algebra**=

[|Totally Free Algebra Book] [|Wiki Algebra Book] [|CK12: Algebra Textbooks] [|Understanding Algebra] [|Algebasics] [|Flat World Knowledge: Elementary Algebra]

=**Geometry**=

[|CK12: Geometry Textbooks]

=**Trigonometry**=

[|CK12 Trigonometry Textbooks]

=**Calculus**=

[|CK!2: Calculus Textooks]

=**Earth Science**=

[|CK12: Earth Science] = = =**Biology**=

[|**CK12: Biology**] [|WikiBooks: Biology, Answering the Big Questions of Life] [|Online Biology Book] [|Jim Kimball's Biology Pages] [|The Biology Project] [|MIT OpenCourseware for Biology] = = =**U.S. History**=

[|Lessons at Hippocampus] [|CK12: United States History] [|Outline of U.S History Digital Text] [|Open Digital Textbook at WikiBooks] [|American History Digital Textbook] [|Digital History] [|Best History Sites] [|MARVEL - Maine's Virtual Library] [|Connexions: A Comprehensive Outline of World History] =**World History**=

[|Wikibooks: World History] [|CK12: U.S. History Sourcebook - Basic] [|CK12: U. S. History Sourcebook - Advanced] [|World History International] [|World History Timeline] [|World History for Kids] =**Physics**=

[|CK!2: People's Physics Book] =**Chemistry**=

[|Flat World Knowledge: Introductory Chemistry] [|WikiBooks: General Chemistry] [|WikiBooks: Introductory Chemistry Online] [|CK12 Chemistry]

=**French**=

[|WikiBooks: French] = = =**Spanish**=

[|WikiBooks: Spanish] [|PDF Version]

= = =**Latin**= [|WikiBooks: Latin] = = =**English**=

[|CK12: English]

= = = = =**General Sites for Free and Open Source Textbooks**=

Project Guttenburg
media type="custom" key="8419544"

media type="custom" key="8419564"