- Physical Geology "H5P" edition
- Open Geology
- An Introduction to Geology
- Historical Geology
- Mineralogy
- Petrology - An Introduction to Igneous and Metamorphic Rocks and Processes
- Introduction to Earth Science (2nd ed)
- Libre Texts Geology Bookshelf
- Geology of California (draft)
- UC Davis LibreTexts Geology
- Open Educational Resources and Geology