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An Introduction to Geology – Free Textbook for College-Level ...
Physical Geology - Open Textbook Library
An Introduction to Geology (Johnson, Affolter, Inkenbrandt, and Mosher)
OpenGeology – Free Open Educational Resources for the …
Introduction to Earth Science - Open Textbook Library
Book Title: Physical Geology - BCcampus Open Publishing
An introduction to geology | OpenLearn - Open University
Introduction to Geology - MIT OpenCourseWare
An Introduction to Geology – Simple Book Publishing
Book Title: Physical Geology – 2nd Edition - BCcampus Open …