Archaeology: The Science of the Human Past by Archaeology: The Science of the Human Past by 
Foundations of Earth Science, Books a la Carte Edition by 
Essentials of Geology by 
Historical Geology by 
Essential Environment by 
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Essentials of Meteorology by 
Essentials of Geology, Books a la Carte Edition by Foundations of Earth Science, Books a la Carte Edition by 
Interpreting Earth History by Historical Geology by Essentials of Meteorology by No textbooks available freely online.