operator: Internet Archive Internet Archive ID: Lyell1837jf09J-a described at URL: https://archive.org/download/Lyell1837jf09J-a/Lyell1837jf09J-a.pdf...
used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:Principles_of_geology_(IA_Lyell1837jf09J-c).pdf...
used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:Principles_of_geology_(IA_Lyell1837jf09J-d).pdf...
used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:Principles_of_geology_(IA_Lyell1837jf09J-b).pdf...
United States//commons.wikimedia.org/wiki/File:Principles_of_geology_(Supplementary_material_in_Charles_Darwin%27s_copy)_(IA_Lyell1837jf09J-a_MS).pdf...
United States//commons.wikimedia.org/wiki/File:Principles_of_geology_(Supplementary_material_in_Charles_Darwin%27s_copy)_(IA_Lyell1837jf09J-b_MS).pdf...
United States//commons.wikimedia.org/wiki/File:Principles_of_geology_(Supplementary_material_in_Charles_Darwin%27s_copy)_(IA_Lyell1837jf09J-d_MS).pdf...
United States//commons.wikimedia.org/wiki/File:Principles_of_geology_(Supplementary_material_in_Charles_Darwin%27s_copy)_(IA_Lyell1837jf09J-c_MS).pdf...