Archive Internet Archive ID: Youatt1845wt42Y described at URL: https://archive.org/download/Youatt1845wt42Y/Youatt1845wt42Y.pdf determination method or standard:...
domain in the United States//commons.wikimedia.org/wiki/File:The_dog_(Supplementary_material_in_Charles_Darwin%27s_copy)_(IA_Youatt1845wt42Y_MS).pdf...