Geology

Free textbook for entry level geology courses.

Including titles: Physical Geology, An Introduction to Geology, Historical Geology, and more.

LibreTexts Geosciences bookshelf includes: Fundamentals of Geology, Physical Geology, and The Dynamic Earth, and more.

Ecosystems, Conservation, Ocean Studies, GIS, Hydrology - you can download free digital textbooks on all this and more from the Earth Science section of National Academies Press.

OER Commons provides a curated collection of geology and physical science textbooks.

A comprehensive resource for researchers in the Earth Sciences. Includes access to OpenGeoSci - a free, public map-based toolset that allows users to search for cross sections, charts, tables, figures, and data from GeoScienceWorld publications.

Dig deeper into geology by learning about everything from ancient fossils and rock formation, to present-day landslides and earthquakes.

The USGS provides accurate geologic maps and geologic information that forms the critical framework for understanding everything from environmental change to natural hazards.